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Investment Securities (Schedule of Marketable Securities) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Available for sale, Amortized Cost $ 94,701 $ 82,329
Available for sale, Gross Unrealized Gains 1,385 1,126
Available for sale, Gross Unrealized Losses 1,303 1,574
Available for sale, Fair Value 94,783 81,881
Held to maturity, Amortized Cost 11,131 12,249
Held to maturity, Gross Unrealized Gains 514 541
Held to maturity, Gross Unrealized Losses 172 214
Held to maturity, Fair Value 11,473 12,576
Asset-Backed Securities [Member] | U.S. Treasury and Federal Agencies [Member]
   
Available for sale, Amortized Cost 29,478 25,233
Available for sale, Gross Unrealized Gains 271 251
Available for sale, Gross Unrealized Losses 1,003 1,080
Available for sale, Fair Value 28,746 24,404
Held to maturity, Amortized Cost 45 64
Held to maturity, Gross Unrealized Gains    
Held to maturity, Gross Unrealized Losses 3 5
Held to maturity, Fair Value 42 59
U.S. Treasury and Federal Agencies [Member] | Direct Obligations [Member]
   
Available for sale, Amortized Cost 7,329 7,505
Available for sale, Gross Unrealized Gains 76 74
Available for sale, Gross Unrealized Losses 7 2
Available for sale, Fair Value 7,398 7,577
U.S. Treasury and Federal Agencies [Member] | Student Loans [Member]
   
Available for sale, Amortized Cost 16,390 [1] 14,461 [1]
Available for sale, Gross Unrealized Gains 100 [1] 92 [1]
Available for sale, Gross Unrealized Losses 570 [1] 624 [1]
Available for sale, Fair Value 15,920 [1] 13,929 [1]
U.S. Treasury and Federal Agencies [Member] | Credit Cards [Member]
   
Available for sale, Amortized Cost 9,816 7,578
Available for sale, Gross Unrealized Gains 64 56
Available for sale, Gross Unrealized Losses 12 31
Available for sale, Fair Value 9,868 7,603
U.S. Treasury and Federal Agencies [Member] | Other Asset-Backed Securities [Member]
   
Available for sale, Amortized Cost 1,265 1,033
Available for sale, Gross Unrealized Gains 104 100
Available for sale, Gross Unrealized Losses 56 79
Available for sale, Fair Value 1,313 1,054
U.S. Treasury and Federal Agencies [Member] | Collateralized Mortgage Backed Securities [Member]
   
Available for sale, Amortized Cost 25,107 23,398
Available for sale, Gross Unrealized Gains 434 325
Available for sale, Gross Unrealized Losses 6 83
Available for sale, Fair Value 25,535 23,640
Held to maturity, Amortized Cost 332 413
Held to maturity, Gross Unrealized Gains 24 26
Held to maturity, Fair Value 356 439
U.S. Treasury and Federal Agencies [Member] | Residential, Subprime, Financing Receivable [Member]
   
Available for sale, Amortized Cost 2,007 2,161
Available for sale, Gross Unrealized Gains 3 3
Available for sale, Gross Unrealized Losses 365 346
Available for sale, Fair Value 1,645 1,818
Asset-Backed Securities [Member] | Non-U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 6,099 3,821
Available for sale, Gross Unrealized Gains 90 88
Available for sale, Gross Unrealized Losses 88 122
Available for sale, Fair Value 6,101 3,787
Held to maturity, Amortized Cost 89 646
Held to maturity, Gross Unrealized Gains 2 18
Held to maturity, Gross Unrealized Losses 1 3
Held to maturity, Fair Value 90 661
Non-U.S. Debt Securities [Member] | Non-U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 20,032 13,984
Available for sale, Gross Unrealized Gains 236 204
Available for sale, Gross Unrealized Losses 122 170
Available for sale, Fair Value 20,146 14,018
Held to maturity, Amortized Cost 6,813 7,186
Held to maturity, Gross Unrealized Gains 189 184
Held to maturity, Gross Unrealized Losses 148 165
Held to maturity, Fair Value 6,854 7,205
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 1,077 990
Available for sale, Gross Unrealized Gains 44 34
Available for sale, Gross Unrealized Losses 1 2
Available for sale, Fair Value 1,120 1,022
Held to maturity, Amortized Cost 782 208
Held to maturity, Gross Unrealized Gains 20  
Held to maturity, Gross Unrealized Losses 4 2
Held to maturity, Fair Value 798 206
Non-U.S. Debt Securities [Member] | Government Securities [Member]
   
Available for sale, Amortized Cost 3,545 2,915
Available for sale, Gross Unrealized Gains    
Available for sale, Gross Unrealized Losses    
Available for sale, Fair Value 3,545 2,915
Non-U.S. Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]
   
Available for sale, Amortized Cost 9,311 6,258
Available for sale, Gross Unrealized Gains 102 82
Available for sale, Gross Unrealized Losses 33 46
Available for sale, Fair Value 9,380 6,294
Held to maturity, Amortized Cost 5,942 6,332
Held to maturity, Gross Unrealized Gains 167 166
Held to maturity, Gross Unrealized Losses 143 160
Held to maturity, Fair Value 5,966 6,338
State and Political Subdivisions [Member]
   
Available for sale, Amortized Cost 6,711 6,706
Available for sale, Gross Unrealized Gains 167 102
Available for sale, Gross Unrealized Losses 131 204
Available for sale, Fair Value 6,747 6,604
Held to maturity, Amortized Cost 119 134
Held to maturity, Gross Unrealized Gains 3 3
Held to maturity, Gross Unrealized Losses    
Held to maturity, Fair Value 122 137
Collateralized Mortgage Obligations [Member]
   
Available for sale, Amortized Cost 2,623 1,828
Available for sale, Gross Unrealized Gains 56 49
Available for sale, Gross Unrealized Losses 25 16
Available for sale, Fair Value 2,654 1,861
Held to maturity, Amortized Cost 3,822 4,452
Held to maturity, Gross Unrealized Gains 298 328
Held to maturity, Gross Unrealized Losses 21 44
Held to maturity, Fair Value 4,099 4,736
Other U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 2,674 2,438
Available for sale, Gross Unrealized Gains 139 116
Available for sale, Gross Unrealized Losses 9 18
Available for sale, Fair Value 2,804 2,536
U.S. Equity Securities [Member]
   
Available for sale, Amortized Cost 559 1,115
Available for sale, Gross Unrealized Gains 4  
Available for sale, Gross Unrealized Losses    
Available for sale, Fair Value 563 1,115
Non-U.S. Equity Securities [Member]
   
Available for sale, Amortized Cost 188 122
Available for sale, Gross Unrealized Gains 2 5
Available for sale, Gross Unrealized Losses   1
Available for sale, Fair Value $ 190 $ 126
[1] Substantially composed of securities guaranteed by the federal government with respect to the payment of principal and interest.