Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Recurring Fair Value (Details)

v2.4.0.6
Fair Value Measurements - Recurring Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Assets        
Federal funds sold and securities borrowed or purchased under agreements to resell $ 94,673 $ 98,670    
Derivative assets 52,247 53,497    
Other Debt Securities Carried at Fair Value 43,282 23,944    
Mortgage servicing rights 5,776 5,716 7,589 7,378
Loans held-for-sale 13,887 11,659    
Other assets 23,243 26,490    
Liabilities        
Federal funds purchased and securities loaned or sold under agreements to repurchase 47,842 42,639    
Long-term debt 52,361 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 94,673 98,670    
Total trading account assets 223,028 227,775    
Derivative assets 52,247 [1] 53,497 [1]    
Total available-for-sale debt securities 261,850 286,906    
Other Debt Securities Carried at Fair Value 43,282 23,944    
Loans and leases 8,820 9,002    
Mortgage servicing rights 5,776 5,716    
Loans held-for-sale 13,887 11,659    
Other assets 23,243 26,490    
Total assets 726,806 743,659    
Liabilities        
Interest-bearing deposits in U.S. offices 2,130 2,262    
Federal funds purchased and securities loaned or sold under agreements to repurchase 47,842 42,639    
Total trading account liabilities 90,547 73,587    
Derivative liabilities 47,825 [1] 46,016 [1]    
Commercial paper and other short-term borrowings 3,168 4,074    
Accrued expenses and other liabilities 14,285 16,594    
Long-term debt 52,361 49,161    
Total liabilities 258,158 234,333    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Federal funds sold and securities borrowed or purchased under agreements to resell    [2]    [3]    
Total trading account assets 114,738 [2] 116,345 [3]    
Derivative assets 5,078 [1],[2] 2,997 [1],[3]    
Total available-for-sale debt securities 17,358 [2] 24,171 [3]    
Other Debt Securities Carried at Fair Value 12,733 [2] 9,642 [3]    
Loans and leases    [2]    [3]    
Mortgage servicing rights    [2]    [3]    
Loans held-for-sale    [2]    [3]    
Other assets 15,578 [2] 18,535 [3]    
Total assets 165,485 [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 75,597 [2] 61,565 [3]    
Derivative liabilities 3,888 [1],[2] 2,859 [1],[3]    
Commercial paper and other short-term borrowings    [2]    [3]    
Accrued expenses and other liabilities 12,016 [2] 15,457 [3]    
Long-term debt    [2]    [3]    
Total liabilities 91,501 [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 94,673 [2] 98,670 [3]    
Total trading account assets 99,289 [2] 101,871 [3]    
Derivative assets 1,201,709 [1],[2] 1,372,398 [1],[3]    
Total available-for-sale debt securities 239,299 [2] 257,644 [3]    
Other Debt Securities Carried at Fair Value 30,549 [2] 14,302 [3]    
Loans and leases 6,457 [2] 6,715 [3]    
Mortgage servicing rights    [2] 0 [3]    
Loans held-for-sale 11,482 [2] 8,926 [3]    
Other assets 5,036 [2] 4,826 [3]    
Total assets 1,688,494 [2] 1,865,352 [3]    
Liabilities        
Interest-bearing deposits in U.S. offices 2,130 [2] 2,262 [3]    
Federal funds purchased and securities loaned or sold under agreements to repurchase 47,842 [2] 42,639 [3]    
Total trading account liabilities 14,892 [2] 11,958 [3]    
Derivative liabilities 1,184,636 [1],[2] 1,355,309 [1],[3]    
Commercial paper and other short-term borrowings 3,168 [2] 4,074 [3]    
Accrued expenses and other liabilities 1,814 [2] 1,122 [3]    
Long-term debt 50,006 [2] 46,860 [3]    
Total liabilities 1,304,488 [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          
Total trading account assets 9,001 9,559    
Derivative assets 8,011 [1] 8,073 [1] 11,300  
Total available-for-sale debt securities 5,193 5,091    
Other Debt Securities Carried at Fair Value 0 [2] 0    
Loans and leases 2,363 2,287    
Mortgage servicing rights 5,776 5,716    
Loans held-for-sale 2,405 [4],[5] 2,733 [4],[5]    
Other assets 2,629 3,129    
Total assets 35,378 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 58 64    
Derivative liabilities 6,948 [1] 6,605 [1] 7,100  
Commercial paper and other short-term borrowings          
Accrued expenses and other liabilities 455 15    
Long-term debt 2,355 2,301    
Total liabilities 9,816 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]    
Total trading account assets    [6]    [6]    
Derivative assets (1,162,551) [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 (1,162,551) [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 (1,147,647) [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 (1,147,647) [6] (1,318,757) [6]    
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member]
        
Liabilities        
Total trading account liabilities 25,764 23,430    
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 25,292 [2] 22,351 [3]    
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 472 [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 24,749 22,492    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 21,786 [2] 19,852 [3]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 2,963 [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 29,377 20,244    
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 27,945 [2] 18,875 [3]    
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 1,432 [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 10,657 7,421    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 574 [2] 487 [3]    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 10,025 [2] 6,870 [3]    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Liabilities        
Total trading account liabilities 58 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        
Total trading account assets 72,878 86,974    
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 47,957 [2] 57,655 [3]    
Other Debt Securities Carried at Fair Value 3,861 [2] 491 [3]    
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 24,921 [2] 29,319 [3]    
Other Debt Securities Carried at Fair Value 0 [2] 0 [3]    
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets          
Other Debt Securities Carried at Fair Value 0 [2] 0    
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
        
Assets        
Total trading account assets    [6]    [6]    
Other Debt Securities Carried at Fair Value    [6]    [6]    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member]
        
Assets        
Total trading account assets 39,183 37,900    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 1,702 [2] 1,292 [3]    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 33,874 [2] 32,882 [3]    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 3,607 3,726    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
        
Assets        
Total trading account assets    [6]    [6]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
        
Assets        
Total trading account assets 45,863 43,315    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 31,398 [2] 28,144 [3]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 13,968 [2] 14,626 [3]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 497 545    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
        
Assets        
Total trading account assets    [6]    [6]    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member]
        
Assets        
Total trading account assets 48,634 42,746    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 33,681 [2] 29,254 [3]    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 14,536 [2] 13,139 [3]    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 417 353    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
        
Assets        
Total trading account assets    [6]    [6]    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member]
        
Assets        
Total trading account assets 16,470 16,840    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets    [2]    [3]    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 11,990 [2] 11,905 [3]    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 4,480 4,935    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
        
Assets        
Total trading account assets    [6]    [6]    
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member]
        
Assets        
Total available-for-sale debt securities 17,439 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 14,639 [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 2,800 [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 174,268 188,149    
Other Debt Securities Carried at Fair Value 29,178 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 174,268 [2] 188,149 [3]    
Other Debt Securities Carried at Fair Value 29,178 [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 34,761 37,538    
Other Debt Securities Carried at Fair Value 958 929    
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 34,761 [2] 37,538 [3]    
Other Debt Securities Carried at Fair Value 958 [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 8,877 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 8,877 [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 3,834 3,924    
Other Debt Securities Carried at Fair Value 103      
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 3,824 [2] 3,914 [3]    
Other Debt Securities Carried at Fair Value 103 [2]      
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 10 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 5,650 5,618    
Other Debt Securities Carried at Fair Value 9,182 9,451    
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities 2,699 [2] 2,637 [3]    
Other Debt Securities Carried at Fair Value 8,872 [2] 9,151 [3]    
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 2,950 [2] 2,981 [3]    
Other Debt Securities Carried at Fair Value 310 [2] 300 [3]    
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 1       
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 1,385 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 1,289 [2] 1,358 [3]    
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 96 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 11,054 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 6,989 [2] 8,180 [3]    
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 4,045 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 4,582 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 3,541 [2] 3,072 [3]    
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 1,041 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        
Other Debt Securities Carried at Fair Value $ 3,861 $ 491    
[1] For further disaggregation of derivative assets and liabilities, see Note 3 – Derivatives.
[2] During the three months ended March 31, 2013, $500 million of 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] (2) Net derivatives include derivative assets of $11.3 billion and derivative liabilities of $7.1 billion.
[5] Assets (liabilities). For assets, increase / (decrease) to Level 3 and for liabilities, (increase) / decrease to Level 3.
[6] Amounts represent the impact of legally enforceable master netting agreements and also cash collateral held or placed with the same counterparties.