Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Recurring Fair Value (Details)

v2.4.0.8
Fair Value Measurements - Recurring Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell $ 103,272   $ 98,670      
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 191,234   227,775      
Derivative assets 56,772   53,497      
Other Debt Securities Carried at Fair Value 41,327   23,944      
Mortgage servicing rights 5,827 5,776 5,716 5,708 7,589 7,378
Loans held-for-sale 10,878   11,659      
Other assets 21,746   26,490      
Liabilities            
Federal funds purchased and securities loaned or sold under agreements to repurchase 59,926   42,639      
Derivative liabilities 48,532   46,016      
Long-term debt 46,439   49,161      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 500   2,000      
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount     350      
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount     785      
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount     40      
Fair Value, Measurements, Recurring [Member]
            
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell 103,272   98,670      
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 191,234   227,775      
Derivative assets 56,772 [1]   53,497 [1]      
Total available-for-sale debt securities 240,154   286,906      
Other Debt Securities Carried at Fair Value 41,327   23,944      
Loans and leases 9,461   9,002      
Mortgage servicing rights 5,827   5,716      
Loans held-for-sale 10,878   11,659      
Other assets 21,746   26,490      
Total assets 680,671   743,659      
Liabilities            
Interest-bearing deposits in U.S. offices 1,978   2,262      
Federal funds purchased and securities loaned or sold under agreements to repurchase 59,926   42,639      
Total trading account liabilities 82,381   73,587      
Derivative liabilities 48,532 [1]   46,016 [1]      
Commercial paper and other short-term borrowings 2,147   4,074      
Accrued expenses and other liabilities 13,302   16,594      
Long-term debt 46,439   49,161      
Total liabilities 254,705   234,333      
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell    [2]      [3]      
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 101,005 [2]   116,345 [3]      
Derivative assets 4,783 [1],[2]   2,997 [1],[3]      
Total available-for-sale debt securities 3,351 [2]   24,171 [3]      
Other Debt Securities Carried at Fair Value 11,525 [2]   9,642 [3]      
Loans and leases    [2]      [3]      
Mortgage servicing rights    [2]      [3]      
Loans held-for-sale    [2]      [3]      
Other assets 15,596 [2]   18,535 [3]      
Total assets 136,260 [2]   171,690 [3]      
Liabilities            
Interest-bearing deposits in U.S. offices    [2]      [3]      
Federal funds purchased and securities loaned or sold under agreements to repurchase    [2]      [3]      
Total trading account liabilities 67,945 [2]   61,565 [3]      
Derivative liabilities 4,713 [1],[2]   2,859 [1],[3]      
Commercial paper and other short-term borrowings    [2]      [3]      
Accrued expenses and other liabilities 11,311 [2]   15,457 [3]      
Long-term debt    [2]      [3]      
Total liabilities 83,969 [2]   79,881 [3]      
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell 103,272 [2]   98,670 [3]      
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 81,916 [2]   101,871 [3]      
Derivative assets 1,013,187 [1],[2]   1,372,398 [1],[3]      
Total available-for-sale debt securities 231,761 [2]   257,644 [3]      
Other Debt Securities Carried at Fair Value 29,802 [2]   14,302 [3]      
Loans and leases 7,560 [2]   6,715 [3]      
Mortgage servicing rights    [2]   0 [3]      
Loans held-for-sale 8,725 [2]   8,926 [3]      
Other assets 4,450 [2]   4,826 [3]      
Total assets 1,480,673 [2]   1,865,352 [3]      
Liabilities            
Interest-bearing deposits in U.S. offices 1,978 [2]   2,262 [3]      
Federal funds purchased and securities loaned or sold under agreements to repurchase 59,926 [2]   42,639 [3]      
Total trading account liabilities 14,381 [2]   11,958 [3]      
Derivative liabilities 996,919 [1],[2]   1,355,309 [1],[3]      
Commercial paper and other short-term borrowings 2,147 [2]   4,074 [3]      
Accrued expenses and other liabilities 1,761 [2]   1,122 [3]      
Long-term debt 44,549 [2]   46,860 [3]      
Total liabilities 1,121,661 [2]   1,464,224 [3]      
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell              
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 8,313   9,559      
Derivative assets 7,714 [1]   8,073 [1] 11,400    
Total available-for-sale debt securities 5,042   5,091      
Other Debt Securities Carried at Fair Value 0 [2]   0      
Loans and leases 1,901   2,287      
Mortgage servicing rights 5,827   5,716      
Loans held-for-sale 2,153 [4],[5]   2,733 [4],[5]      
Other assets 1,700   3,129      
Total assets 32,650   36,588      
Liabilities            
Interest-bearing deposits in U.S. offices              
Federal funds purchased and securities loaned or sold under agreements to repurchase              
Total trading account liabilities 55   64      
Derivative liabilities 6,541 [1]   6,605 [1] 6,800    
Commercial paper and other short-term borrowings              
Accrued expenses and other liabilities 230   15      
Long-term debt 1,890   2,301      
Total liabilities 8,716   8,985      
Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell    [6]      [6]      
Trading account assets (includes $94,021 and $115,821 pledged as collateral)    [6]      [6]      
Derivative assets (968,912) [1],[6]   (1,329,971) [1],[6]      
Total available-for-sale debt securities    [6]      [6]      
Other Debt Securities Carried at Fair Value    [6]      [6]      
Loans and leases    [6]      [6]      
Mortgage servicing rights    [6]      [6]      
Loans held-for-sale    [6]      [6]      
Other assets    [6]      [6]      
Total assets (968,912) [6]   (1,329,971) [6]      
Liabilities            
Interest-bearing deposits in U.S. offices    [6]      [6]      
Federal funds purchased and securities loaned or sold under agreements to repurchase    [6]      [6]      
Total trading account liabilities    [6]      [6]      
Derivative liabilities (959,641) [1],[6]   (1,318,757) [1],[6]      
Commercial paper and other short-term borrowings    [6]      [6]      
Accrued expenses and other liabilities    [6]      [6]      
Long-term debt    [6]      [6]      
Total liabilities (959,641) [6]   (1,318,757) [6]      
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Liabilities            
Total trading account liabilities 21,868   23,430      
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 21,335 [2]   22,351 [3]      
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 533 [2]   1,079 [3]      
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Liabilities            
Total trading account liabilities              
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Liabilities            
Total trading account liabilities    [6]      [6]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Liabilities            
Total trading account liabilities 25,952   22,492      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 22,752 [2]   19,852 [3]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 3,200 [2]   2,640 [3]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Liabilities            
Total trading account liabilities              
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Liabilities            
Total trading account liabilities    [6]      [6]      
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Liabilities            
Total trading account liabilities 25,127   20,244      
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 23,376 [2]   18,875 [3]      
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 1,751 [2]   1,369 [3]      
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Liabilities            
Total trading account liabilities              
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Liabilities            
Total trading account liabilities    [6]      [6]      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member]
            
Liabilities            
Total trading account liabilities 9,434   7,421      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 482 [2]   487 [3]      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 8,897 [2]   6,870 [3]      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Liabilities            
Total trading account liabilities 55   64      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Liabilities            
Total trading account liabilities    [6]      [6]      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 54,409   86,974      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 40,251 [2]   57,655 [3]      
Other Debt Securities Carried at Fair Value     491 [3]      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 14,158 [2]   29,319 [3]      
Other Debt Securities Carried at Fair Value     0 [3]      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral)              
Other Debt Securities Carried at Fair Value     0      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral)    [6]      [6]      
Other Debt Securities Carried at Fair Value        [6]      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 34,557   37,900      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 1,333 [2]   1,292 [3]      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 30,461 [2]   32,882 [3]      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 2,763   3,726      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral)    [6]      [6]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 44,075   43,315      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 29,451 [2]   28,144 [3]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 14,160 [2]   14,626 [3]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 464   545      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral)    [6]      [6]      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 42,943   42,746      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 29,970 [2]   29,254 [3]      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 12,572 [2]   13,139 [3]      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 401   353      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral)    [6]      [6]      
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 15,250   16,840      
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral)    [2]      [3]      
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 10,565 [2]   11,905 [3]      
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 4,685   4,935      
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral)    [6]      [6]      
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 3,099   24,472      
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities 516 [2]   21,514 [3]      
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 2,583 [2]   2,958 [3]      
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities              
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Agency [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 169,184   188,149      
Other Debt Securities Carried at Fair Value 26,121   13,073      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Other Debt Securities Carried at Fair Value 0 [2]      [3]      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 169,184 [2]   188,149 [3]      
Other Debt Securities Carried at Fair Value 26,121 [2]   13,073 [3]      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 0   0      
Other Debt Securities Carried at Fair Value 0 [2]   0      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Other Debt Securities Carried at Fair Value    [6]      [6]      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 32,001   37,538      
Other Debt Securities Carried at Fair Value 1,006   929      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Other Debt Securities Carried at Fair Value 0 [2]      [3]      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 32,001 [2]   37,538 [3]      
Other Debt Securities Carried at Fair Value 1,006 [2]   929 [3]      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities              
Other Debt Securities Carried at Fair Value 0 [2]   0      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]          
Other Debt Securities Carried at Fair Value    [6]      [6]      
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 8,026   9,494      
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 8,026 [2]   9,494 [3]      
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 0   0      
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 3,748   3,924      
Other Debt Securities Carried at Fair Value 758          
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Other Debt Securities Carried at Fair Value 0 [2]          
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 3,748 [2]   3,914 [3]      
Other Debt Securities Carried at Fair Value 758 [2]          
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 0   10      
Other Debt Securities Carried at Fair Value 0 [2]          
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Other Debt Securities Carried at Fair Value    [6]          
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 6,422   5,618      
Other Debt Securities Carried at Fair Value 13,442   9,451      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities 2,815 [2]   2,637 [3]      
Other Debt Securities Carried at Fair Value 11,525 [2]   9,151 [3]      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 3,607 [2]   2,981 [3]      
Other Debt Securities Carried at Fair Value 1,917 [2]   300 [3]      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities              
Other Debt Securities Carried at Fair Value 0 [2]   0      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Other Debt Securities Carried at Fair Value    [6]      [6]      
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 1,231   1,450      
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 1,223 [2]   1,358 [3]      
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 8   92      
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 11,482   12,128      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities 20 [2]   20 [3]      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 7,305 [2]   8,180 [3]      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 4,157   3,928      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 4,961   4,133      
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 4,084 [2]   3,072 [3]      
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 877   1,061      
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Private Equity Investment [Member]
            
Liabilities            
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount     940      
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount     535      
US Government Corporations and Agencies Securities [Member]
            
Assets            
Trading account assets (includes $94,021 and $115,821 pledged as collateral) 54,409 [7]   86,974 [7]      
Other Debt Securities Carried at Fair Value $ 0   $ 491      
[1] For further disaggregation of derivative assets and liabilities, see Note 3 – Derivatives.
[2] During the six months ended June 30, 2013, $500 million of other assets were transferred from Level 1 to Level 2 primarily due to a restriction that became effective for a private equity investment.
[3] During 2012, $2.0 billion and $350 million of assets and liabilities were transferred from Level 1 to Level 2, and $785 million and $40 million of assets and liabilities were transferred from Level 2 to Level 1. Of the asset transfers from Level 1 to Level 2, $940 million was due to a restriction that became effective for a private equity investment during 2012, while $535 million of the transfers from Level 2 to Level 1 was due to the lapse of this restriction during 2012. The remaining transfers were the result of additional information associated with certain equities, derivative contracts and private equity investments.
[4] Assets (liabilities). For assets, increase / (decrease) to Level 3 and for liabilities, (increase) / decrease to Level 3.
[5] During the three months ended June 30, 2012, approximately $900 million was reclassified from Trading account assets - Corporate securities, trading loans and other to Trading account assets - Mortgage trading loans and ABS. In the table above, this reclassification is presented as a sale of Trading account assets - Corporate securities, trading loans and other and as a purchase of Trading account assets - Mortgage trading loans and ABS.
[6] Amounts represent the impact of legally enforceable master netting agreements and also cash collateral held or placed with the same counterparties.
[7] Includes $15.2 billion and $30.6 billion of government-sponsored enterprise obligations at June 30, 2013 and December 31, 2012.