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 $)
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Assets        
Federal funds sold and securities borrowed or purchased under agreements to resell $ 95,003,000,000 $ 87,453,000,000    
Derivative assets 59,051,000,000 73,023,000,000    
Mortgage servicing rights 7,589,000,000 7,378,000,000 15,282,000,000 14,900,000,000
Loans held-for-sale 7,558,000,000 7,630,000,000    
Other assets 35,671,000,000 37,084,000,000    
Liabilities        
Federal funds purchased and securities loaned or sold under agreements to repurchase 54,434,000,000 34,235,000,000    
Long-term debt 51,037,000,000 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 250,000,000      
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 95,003,000,000 87,453,000,000    
Total trading account assets 209,775,000,000 169,319,000,000    
Derivative assets 59,051,000,000 73,023,000,000    
Total available-for-sale debt securities 297,040,000,000 276,151,000,000    
Loans And Leases Fair Value Disclosure 9,192,000,000 8,804,000,000    
Mortgage servicing rights 7,589,000,000 7,378,000,000    
Loans held-for-sale 7,558,000,000 7,630,000,000    
Other assets 35,671,000,000 37,084,000,000    
Total assets 720,879,000,000 666,842,000,000    
Liabilities        
Interest-bearing deposits in U.S. offices 3,191,000,000 3,297,000,000    
Federal funds purchased and securities loaned or sold under agreements to repurchase 54,434,000,000 34,235,000,000    
Total trading account liabilities 70,414,000,000 60,508,000,000    
Derivative liabilities 49,172,000,000 59,520,000,000    
Commercial paper and other short-term borrowings 6,395,000,000 6,558,000,000    
Accrued expenses and other liabilities 18,459,000,000 15,743,000,000    
Long-term debt 51,037,000,000 46,239,000,000    
Total liabilities 253,102,000,000 226,100,000,000    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Federal funds sold and securities borrowed or purchased under agreements to resell    [1]    [2]    
Total trading account assets 109,896,000,000 82,455,000,000 [2]    
Derivative assets 2,780,000,000 [1],[3] 2,186,000,000 [2],[3]    
Total available-for-sale debt securities 39,922,000,000 41,073,000,000 [2]    
Loans And Leases Fair Value Disclosure    [1]    [1],[2]    
Mortgage servicing rights    [1]    [2]    
Loans held-for-sale    [1]    [2]    
Other assets 22,153,000,000 [1] 18,963,000,000 [2]    
Total assets 174,751,000,000 144,677,000,000 [2]    
Liabilities        
Interest-bearing deposits in U.S. offices    [1]    [2]    
Federal funds purchased and securities loaned or sold under agreements to repurchase    [1]    [2]    
Total trading account liabilities 57,864,000,000 49,968,000,000 [2]    
Derivative liabilities 2,437,000,000 [1],[3] 2,055,000,000 [2],[3]    
Commercial paper and other short-term borrowings    [1]    [2]    
Accrued expenses and other liabilities 16,775,000,000 [1] 13,832,000,000 [2]    
Long-term debt    [1]    [2]    
Total liabilities 77,076,000,000 65,855,000,000 [2]    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Federal funds sold and securities borrowed or purchased under agreements to resell 95,003,000,000 [1] 87,453,000,000 [2]    
Total trading account assets 88,795,000,000 75,409,000,000 [2]    
Derivative assets 1,488,433,000,000 [1],[3] 1,865,310,000,000 [2],[3]    
Total available-for-sale debt securities 250,817,000,000 227,066,000,000 [2]    
Loans And Leases Fair Value Disclosure 6,410,000,000 [1] 6,060,000,000 [1],[2]    
Mortgage servicing rights    [1] 0 [2]    
Loans held-for-sale 4,696,000,000 [1] 4,243,000,000 [2]    
Other assets 10,031,000,000 [1] 13,886,000,000 [2]    
Total assets 1,944,185,000,000 2,279,427,000,000 [2]    
Liabilities        
Interest-bearing deposits in U.S. offices 3,191,000,000 [1] 3,297,000,000 [2]    
Federal funds purchased and securities loaned or sold under agreements to repurchase 54,434,000,000 [1] 34,235,000,000 [2]    
Total trading account liabilities 12,426,000,000 10,426,000,000 [2]    
Derivative liabilities 1,468,536,000,000 [1],[3] 1,850,804,000,000 [2],[3]    
Commercial paper and other short-term borrowings 6,395,000,000 [1] 6,558,000,000 [2]    
Accrued expenses and other liabilities 1,681,000,000 [1] 1,897,000,000 [2]    
Long-term debt 48,537,000,000 [1] 43,296,000,000 [2]    
Total liabilities 1,595,200,000,000 1,950,513,000,000 [2]    
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 11,084,000,000 11,455,000,000    
Derivative assets 11,315,000,000 [3] 14,366,000,000 [3] 16,200,000,000  
Total available-for-sale debt securities 6,301,000,000 8,012,000,000    
Loans And Leases Fair Value Disclosure 2,782,000,000 2,744,000,000    
Mortgage servicing rights 7,589,000,000 7,378,000,000    
Loans held-for-sale 2,862,000,000 [4],[5] 3,387,000,000    
Other assets 3,487,000,000 4,235,000,000    
Total assets 45,420,000,000 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 124,000,000 114,000,000    
Derivative liabilities 7,128,000,000 8,500,000,000 [3] 9,800,000,000  
Commercial paper and other short-term borrowings          
Accrued expenses and other liabilities 3,000,000 14,000,000    
Long-term debt 2,500,000,000 2,943,000,000    
Total liabilities 9,755,000,000 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          
Derivative assets (1,443,477,000,000) [3],[6] (1,808,839,000,000) [3],[6]    
Total available-for-sale debt securities          
Loans And Leases Fair Value Disclosure    [6]    [6]    
Mortgage servicing rights    [6]    [6]    
Loans held-for-sale    [6]    [6]    
Other assets    [6]    [6]    
Total assets (1,443,477,000,000) (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          
Derivative liabilities (1,428,929,000,000) [3],[6] (1,801,839,000,000) [3],[6]    
Commercial paper and other short-term borrowings    [6]    [6]    
Accrued expenses and other liabilities    [6]    [6]    
Long-term debt    [6]    [6]    
Total liabilities (1,428,929,000,000) (1,801,839,000,000) [6]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
        
Liabilities        
Total trading account liabilities 21,651,000,000 14,594,000,000    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 19,571,000,000 [1] 13,259,000,000 [2]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 2,080,000,000 [1] 1,335,000,000 [2]    
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]    
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member]
        
Liabilities        
Total trading account liabilities 20,550,000,000 20,710,000,000    
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 19,789,000,000 [1] 19,120,000,000 [2]    
US Government Corporations and Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 761,000,000 [1] 1,590,000,000 [2]    
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]    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member]
        
Liabilities        
Total trading account liabilities 9,167,000,000 7,764,000,000    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 638,000,000 [1] 829,000,000 [2]    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 8,405,000,000 [1] 6,821,000,000 [2]    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Liabilities        
Total trading account liabilities 124,000,000 114,000,000    
Corporate securities, trading loans and other [Member] | Fair Value, Measurements, Recurring [Member] | Netting Adjustments [Member]
        
Liabilities        
Total trading account liabilities    [6]    [6]    
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
        
Liabilities        
Total trading account liabilities 19,046,000,000 17,440,000,000    
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Liabilities        
Total trading account liabilities 17,866,000,000 [1] 16,760,000,000 [2]    
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Liabilities        
Total trading account liabilities 1,180,000,000 [1] 680,000,000 [2]    
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]    
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member]
        
Assets        
Total trading account assets 69,664,000,000 52,613,000,000    
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 44,083,000,000 [1] 30,540,000,000 [2]    
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 25,581,000,000 [1] 22,073,000,000 [2]    
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 39,110,000,000 36,571,000,000    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 994,000,000 [1] 1,067,000,000 [2]    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 32,115,000,000 [1] 28,624,000,000 [2]    
Corporate securities and other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 6,001,000,000 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 33,335,000,000 23,674,000,000    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 24,574,000,000 [1] 17,181,000,000 [2]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 8,236,000,000 [1] 5,949,000,000 [2]    
Equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 525,000,000 544,000,000    
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 52,071,000,000 42,946,000,000    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets 40,245,000,000 [1] 33,667,000,000 [2]    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 11,280,000,000 [1] 8,937,000,000 [2]    
Non-U.S. sovereign debt [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 546,000,000 342,000,000    
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 15,595,000,000 13,515,000,000    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total trading account assets    [1]    [2]    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total trading account assets 11,583,000,000 [1] 9,826,000,000 [2]    
Mortgage trading loans and ABS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total trading account assets 4,012,000,000 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 39,966,000,000 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 36,539,000,000 [1] 39,389,000,000 [2]    
U.S. Treasury securities and agency securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 3,427,000,000 [1] 3,475,000,000 [2]    
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]    
Agency [Member] | Fair Value, Measurements, Recurring [Member]
        
Assets        
Total available-for-sale debt securities 175,091,000,000 142,563,000,000    
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities    [1]    [2]    
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 175,058,000,000 [1] 142,526,000,000 [2]    
Agency [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 33,000,000 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 42,355,000,000 44,999,000,000    
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities    [1]    [2]    
Agency-collateralized mortgage obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 42,355,000,000 [1] 44,999,000,000 [2]    
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 11,470,000,000 14,767,000,000    
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities    [1]    [2]    
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 11,441,000,000 [1] 13,907,000,000 [2]    
Non-agency residential [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 29,000,000 860,000,000    
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 4,899,000,000 5,522,000,000    
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities    [1]    [2]    
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 4,861,000,000 [1] 5,482,000,000 [2]    
Non-agency commercial [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 38,000,000 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 6,568,000,000 4,920,000,000    
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities 3,363,000,000 [1] 1,664,000,000 [2]    
Non-U.S. Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 3,205,000,000 [1] 3,256,000,000 [2]    
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 2,421,000,000 3,035,000,000    
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities    [1]    [2]    
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 2,290,000,000 [1] 2,873,000,000 [2]    
Corporate/Agency bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 131,000,000 162,000,000    
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 10,617,000,000 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 [1] 20,000,000 [2]    
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 6,422,000,000 [1] 8,593,000,000 [2]    
Other taxable securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 4,175,000,000 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 3,653,000,000 4,603,000,000    
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Assets        
Total available-for-sale debt securities    [1]    [2]    
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Assets        
Total available-for-sale debt securities 1,758,000,000 [1] 1,955,000,000 [2]    
Tax-exempt securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Assets        
Total available-for-sale debt securities 1,895,000,000 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 2 to level 1 Transfers, Amount $ 640,000,000      
[1] During the three months ended March 31, 2012, approximately $1.7 billion and $350 million of assets and liabilities were transferred from Level 1 to Level 2, and approximately $250 million and $40 million of assets and liabilities were transferred from Level 2 to Level 1. Approximately $640 million of the transfer from Level 1 to Level 2 was due to a restriction that became effective for a private equity investment. The remaining transfers were the result of additional information associated with certain equities, derivative contracts and private equity investments.
[2] Gross transfers between Level 1 and Level 2 during 2011 were not significant.
[3] For further disaggregation of derivative assets and liabilities, see Note 3 – Derivatives.
[4] Assets (liabilities). For assets, increase / (decrease) to Level 3 and for liabilities, (increase) / decrease to Level 3.
[5] Amounts represent items that are accounted for under the fair value option.
[6] Amounts represent the impact of legally enforceable master netting agreements and also cash collateral held or placed with the same counterparties.