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 $)
 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell $ 94,687,000,000   $ 87,453,000,000      
Derivative assets 59,939,000,000   73,023,000,000      
Mortgage servicing rights 5,708,000,000 7,589,000,000 7,378,000,000 12,372,000,000 15,282,000,000 14,900,000,000
Loans held-for-sale 10,187,000,000   7,630,000,000      
Other assets 32,625,000,000   37,084,000,000      
Liabilities            
Federal funds purchased and securities loaned or sold under agreements to repurchase 48,663,000,000   34,235,000,000      
Long-term debt 48,345,000,000   46,239,000,000      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 1,700,000,000          
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 350,000,000          
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 785,000,000          
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 40,000,000          
Fair Value, Measurements, Recurring [Member]
            
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell 94,687,000,000   87,453,000,000      
Total trading account assets 204,725,000,000   169,319,000,000      
Derivative assets 59,939,000,000 [1]   73,023,000,000 [1]      
Total available-for-sale debt securities 300,049,000,000   276,151,000,000      
Loans and leases 8,361,000,000   8,804,000,000      
Mortgage servicing rights 5,708,000,000   7,378,000,000      
Loans held-for-sale 10,187,000,000   7,630,000,000      
Other assets 32,625,000,000   37,084,000,000      
Total assets 716,281,000,000   666,842,000,000      
Liabilities            
Interest-bearing deposits in U.S. offices 2,874,000,000   3,297,000,000      
Federal funds purchased and securities loaned or sold under agreements to repurchase 48,663,000,000   34,235,000,000      
Total trading account liabilities 77,458,000,000   60,508,000,000      
Derivative liabilities 51,515,000,000 [1]   59,520,000,000 [1]      
Commercial paper and other short-term borrowings 4,468,000,000   6,558,000,000      
Accrued expenses and other liabilities 17,509,000,000   15,743,000,000      
Long-term debt 48,345,000,000   46,239,000,000      
Total liabilities 250,832,000,000   226,100,000,000      
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 109,777,000,000 [2]   82,455,000,000 [3]      
Derivative assets 2,393,000,000 [1],[2]   2,186,000,000 [1],[3]      
Total available-for-sale debt securities 29,834,000,000 [2]   41,073,000,000 [3]      
Loans and leases    [2]      [3]      
Mortgage servicing rights    [2]      [3]      
Loans held-for-sale    [2]      [3]      
Other assets 19,570,000,000 [2]   18,963,000,000 [3]      
Total assets 161,574,000,000 [2]   144,677,000,000 [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 63,702,000,000 [2]   49,968,000,000 [3]      
Derivative liabilities 2,145,000,000 [1],[2]   2,055,000,000 [1],[3]      
Commercial paper and other short-term borrowings    [2]      [3]      
Accrued expenses and other liabilities 15,972,000,000 [2]   13,832,000,000 [3]      
Long-term debt    [2]      [3]      
Total liabilities 81,819,000,000 [2]   65,855,000,000 [3]      
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Federal funds sold and securities borrowed or purchased under agreements to resell 94,687,000,000 [2]   87,453,000,000 [3]      
Total trading account assets 84,685,000,000 [2]   75,409,000,000 [3]      
Derivative assets 1,562,365,000,000 [1],[2]   1,865,310,000,000 [1],[3]      
Total available-for-sale debt securities 264,399,000,000 [2]   227,066,000,000 [3]      
Loans and leases 6,726,000,000 [2]   6,060,000,000 [3]      
Mortgage servicing rights    [2]   0 [3]      
Loans held-for-sale 7,446,000,000 [2]   4,243,000,000 [3]      
Other assets 9,919,000,000 [2]   13,886,000,000 [3]      
Total assets 2,030,227,000,000 [2]   2,279,427,000,000 [3]      
Liabilities            
Interest-bearing deposits in U.S. offices 2,874,000,000 [2]   3,297,000,000 [3]      
Federal funds purchased and securities loaned or sold under agreements to repurchase 48,663,000,000 [2]   34,235,000,000 [3]      
Total trading account liabilities 13,613,000,000 [2]   10,426,000,000 [3]      
Derivative liabilities 1,551,295,000,000 [1],[2]   1,850,804,000,000 [1],[3]      
Commercial paper and other short-term borrowings 4,468,000,000 [2]   6,558,000,000 [3]      
Accrued expenses and other liabilities 1,535,000,000 [2]   1,897,000,000 [3]      
Long-term debt 45,957,000,000 [2]   43,296,000,000 [3]      
Total liabilities 1,668,405,000,000 [2]   1,950,513,000,000 [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 10,263,000,000   11,455,000,000      
Derivative assets 11,397,000,000 [1]   14,366,000,000 [1] 15,200,000,000    
Total available-for-sale debt securities 5,816,000,000   8,012,000,000      
Loans and leases 1,635,000,000   2,744,000,000      
Mortgage servicing rights 5,708,000,000   7,378,000,000      
Loans held-for-sale 2,741,000,000 [4],[5]   3,387,000,000 [4],[5]      
Other assets 3,136,000,000   4,235,000,000      
Total assets 40,696,000,000   51,577,000,000      
Liabilities            
Interest-bearing deposits in U.S. offices              
Federal funds purchased and securities loaned or sold under agreements to repurchase              
Total trading account liabilities 143,000,000   114,000,000      
Derivative liabilities 6,796,000,000 [1]   8,500,000,000 [1] 9,800,000,000    
Commercial paper and other short-term borrowings              
Accrued expenses and other liabilities 2,000,000   14,000,000      
Long-term debt 2,388,000,000   2,943,000,000      
Total liabilities 9,329,000,000   11,571,000,000      
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 (1,516,216,000,000) [1],[6]   (1,808,839,000,000) [1],[6]      
Total available-for-sale debt securities    [6]      [6]      
Loans and leases    [6]      [6]      
Mortgage servicing rights    [6]      [6]      
Loans held-for-sale    [6]      [6]      
Other assets    [6]      [6]      
Total assets (1,516,216,000,000) [6]   (1,808,839,000,000) [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 (1,508,721,000,000) [1],[6]   (1,801,839,000,000) [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 (1,508,721,000,000) [6]   (1,801,839,000,000) [6]      
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Liabilities            
Total trading account liabilities 23,959,000,000   20,710,000,000      
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 22,481,000,000 [2]   19,120,000,000 [3]      
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 1,478,000,000 [2]   1,590,000,000 [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 25,016,000,000   14,594,000,000      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 22,849,000,000 [2]   13,259,000,000 [3]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 2,167,000,000 [2]   1,335,000,000 [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 19,137,000,000   17,440,000,000      
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 17,756,000,000 [2]   16,760,000,000 [3]      
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 1,381,000,000 [2]   680,000,000 [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 9,346,000,000   7,764,000,000      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Liabilities            
Total trading account liabilities 616,000,000 [2]   829,000,000 [3]      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Liabilities            
Total trading account liabilities 8,587,000,000 [2]   6,821,000,000 [3]      
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Liabilities            
Total trading account liabilities 143,000,000   114,000,000      
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 76,234,000,000   52,613,000,000      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total trading account assets 51,020,000,000 [2]   30,540,000,000 [3]      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total trading account assets 25,214,000,000 [2]   22,073,000,000 [3]      
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total trading account assets              
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total trading account assets    [6]      [6]      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total trading account assets 32,089,000,000   36,571,000,000      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total trading account assets 1,415,000,000 [2]   1,067,000,000 [3]      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total trading account assets 26,215,000,000 [2]   28,624,000,000 [3]      
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total trading account assets 4,459,000,000   6,880,000,000      
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 29,518,000,000   23,674,000,000      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total trading account assets 19,009,000,000 [2]   17,181,000,000 [3]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total trading account assets 9,912,000,000 [2]   5,949,000,000 [3]      
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total trading account assets 597,000,000   544,000,000      
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 51,279,000,000   42,946,000,000      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total trading account assets 38,333,000,000 [2]   33,667,000,000 [3]      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total trading account assets 12,557,000,000 [2]   8,937,000,000 [3]      
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total trading account assets 389,000,000   342,000,000      
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 15,605,000,000   13,515,000,000      
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 10,787,000,000 [2]   9,826,000,000 [3]      
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total trading account assets 4,818,000,000   3,689,000,000      
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 29,831,000,000   42,864,000,000      
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities 26,681,000,000 [2]   39,389,000,000 [3]      
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 3,150,000,000 [2]   3,475,000,000 [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 194,191,000,000   142,563,000,000      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 194,191,000,000 [2]   142,526,000,000 [3]      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 0   37,000,000      
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 39,149,000,000   44,999,000,000      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 39,149,000,000 [2]   44,999,000,000 [3]      
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities              
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]          
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 10,515,000,000   14,767,000,000      
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 10,514,000,000 [2]   13,907,000,000 [3]      
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 1,000,000   860,000,000      
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 4,127,000,000   5,522,000,000      
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities    [2]      [3]      
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 4,103,000,000 [2]   5,482,000,000 [3]      
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 24,000,000   40,000,000      
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 5,765,000,000   4,920,000,000      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities 3,133,000,000 [2]   1,664,000,000 [3]      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 2,632,000,000 [2]   3,256,000,000 [3]      
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities              
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
            
Assets            
Total available-for-sale debt securities    [6]      [6]      
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member]
            
Assets            
Total available-for-sale debt securities 2,122,000,000   3,035,000,000      
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 2,029,000,000 [2]   2,873,000,000 [3]      
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 93,000,000   162,000,000      
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 11,522,000,000   12,878,000,000      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
            
Assets            
Total available-for-sale debt securities 20,000,000 [2]   20,000,000 [3]      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
            
Assets            
Total available-for-sale debt securities 6,944,000,000 [2]   8,593,000,000 [3]      
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 4,558,000,000   4,265,000,000      
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 2,827,000,000   4,603,000,000      
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 1,687,000,000 [2]   1,955,000,000 [3]      
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
            
Assets            
Total available-for-sale debt securities 1,140,000,000   2,648,000,000      
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, Level 1 to level 2 Transfers, Amount 640,000,000          
Fair Value, Level 2 to level 1 Transfers, Amount $ 535,000,000          
[1] For further disaggregation of derivative assets and liabilities, see Note 3 – Derivatives.
[2] During the six months ended June 30, 2012, $1.7 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 transfer from Level 1 to Level 2, $640 million was due to a restriction that became effective for a private equity investment during the first quarter of 2012, while $535 million of the transfer from Level 2 to Level 1 was due to the lapse of this restriction during the second quarter of 2012. The remaining transfers were the result of additional information associated with certain equities, derivative contracts and private equity investments.
[3] Gross transfers between Level 1 and Level 2 during 2011 were not significant.
[4] Amounts represent items that are accounted for under the fair value option.
[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.