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Investment Securities (Schedule Of Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Available for sale, Amortized Cost $ 100,013 $ 82,329
Available for sale, Gross Unrealized Gains 1,471 1,126
Available for sale, Gross Unrealized Losses 1,652 1,574
Available for sale, Fair Value 99,832 81,881
Held to maturity, Amortized Cost 9,321 12,249
Held to maturity, Gross Unrealized Gains 344 541
Held to maturity, Gross Unrealized Losses 303 214
Held to maturity, Fair Value 9,362 12,576
Student Loans [Member]
   
Available for sale, Amortized Cost 17,187 [1] 14,975 [1]
Available for sale, Gross Unrealized Gains 69 [1] 92 [1]
Available for sale, Gross Unrealized Losses 711 [1] 652 [1]
Available for sale, Fair Value 16,545 [1] 14,415 [1]
Credit Cards [Member]
   
Available for sale, Amortized Cost 10,448 7,578
Available for sale, Gross Unrealized Gains 53 56
Available for sale, Gross Unrealized Losses 14 31
Available for sale, Fair Value 10,487 7,603
Sub-Prime [Member]
   
Available for sale, Amortized Cost 1,849 2,161
Available for sale, Gross Unrealized Gains 2 3
Available for sale, Gross Unrealized Losses 447 346
Available for sale, Fair Value 1,404 1,818
Other Asset-Backed Securities [Member]
   
Available for sale, Amortized Cost 3,421 2,550
Available for sale, Gross Unrealized Gains 169 175
Available for sale, Gross Unrealized Losses 125 156
Available for sale, Fair Value 3,465 2,569
Asset-Backed Securities [Member]
   
Available for sale, Amortized Cost 32,905 27,264
Available for sale, Gross Unrealized Gains 293 326
Available for sale, Gross Unrealized Losses 1,297 1,185
Available for sale, Fair Value 31,901 26,405
State And Political Subdivisions [Member]
   
Available for sale, Amortized Cost 6,924 6,706
Available for sale, Gross Unrealized Gains 244 102
Available for sale, Gross Unrealized Losses 121 204
Available for sale, Fair Value 7,047 6,604
Held to maturity, Amortized Cost 107 134
Held to maturity, Gross Unrealized Gains 3 3
Held to maturity, Gross Unrealized Losses     
Held to maturity, Fair Value 110 137
Collateralized Mortgage Obligations [Member]
   
Available for sale, Amortized Cost 3,971 1,828
Available for sale, Gross Unrealized Gains 62 49
Available for sale, Gross Unrealized Losses 53 16
Available for sale, Fair Value 3,980 1,861
Held to maturity, Amortized Cost 3,334 4,452
Held to maturity, Gross Unrealized Gains 220 328
Held to maturity, Gross Unrealized Losses 57 44
Held to maturity, Fair Value 3,497 4,736
Other U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 3,471 2,438
Available for sale, Gross Unrealized Gains 159 116
Available for sale, Gross Unrealized Losses 15 18
Available for sale, Fair Value 3,615 2,536
U.S. Equity Securities [Member]
   
Available for sale, Amortized Cost 639 1,115
Available for sale, Gross Unrealized Gains 1   
Available for sale, Gross Unrealized Losses     
Available for sale, Fair Value 640 1,115
Non-U.S. Equity Securities [Member]
   
Available for sale, Amortized Cost 118 122
Available for sale, Gross Unrealized Gains   5
Available for sale, Gross Unrealized Losses   1
Available for sale, Fair Value 118 126
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
   
Available for sale, Amortized Cost 2,798 7,505
Available for sale, Gross Unrealized Gains 39 74
Available for sale, Gross Unrealized Losses 1 2
Available for sale, Fair Value 2,836 7,577
U.S. Treasury And Federal Agencies [Member] | Asset-Backed Securities [Member]
   
Held to maturity, Amortized Cost 31 64
Held to maturity, Gross Unrealized Gains     
Held to maturity, Gross Unrealized Losses 2 5
Held to maturity, Fair Value 29 59
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
   
Available for sale, Amortized Cost 29,511 23,398
Available for sale, Gross Unrealized Gains 538 325
Available for sale, Gross Unrealized Losses 28 83
Available for sale, Fair Value 30,021 23,640
Held to maturity, Amortized Cost 265 413
Held to maturity, Gross Unrealized Gains 18 26
Held to maturity, Fair Value 283 439
Non-U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 19,676 11,953
Available for sale, Gross Unrealized Gains 135 129
Available for sale, Gross Unrealized Losses 137 65
Available for sale, Fair Value 19,674 12,017
Held to maturity, Amortized Cost 5,584 7,186
Held to maturity, Gross Unrealized Gains 103 184
Held to maturity, Gross Unrealized Losses 244 165
Held to maturity, Fair Value 5,443 7,205
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
   
Available for sale, Amortized Cost 4,318 1,790
Available for sale, Gross Unrealized Gains 2 13
Available for sale, Gross Unrealized Losses 17 17
Available for sale, Fair Value 4,303 1,786
Held to maturity, Amortized Cost 436 646
Held to maturity, Gross Unrealized Gains 16 18
Held to maturity, Gross Unrealized Losses 3 3
Held to maturity, Fair Value 449 661
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 2,797 1,900
Available for sale, Gross Unrealized Gains 41 34
Available for sale, Gross Unrealized Losses 13 2
Available for sale, Fair Value 2,825 1,932
Held to maturity, Amortized Cost 172 208
Held to maturity, Gross Unrealized Gains     
Held to maturity, Gross Unrealized Losses 17 2
Held to maturity, Fair Value 155 206
Non-U.S. Debt Securities [Member] | Government Securities [Member]
   
Available for sale, Amortized Cost 1,671 2,005
Available for sale, Gross Unrealized Gains     
Available for sale, Gross Unrealized Losses     
Available for sale, Fair Value 1,671 2,005
Held to maturity, Amortized Cost 3  
Held to maturity, Fair Value 3  
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
   
Available for sale, Amortized Cost 10,890 6,258
Available for sale, Gross Unrealized Gains 92 82
Available for sale, Gross Unrealized Losses 107 46
Available for sale, Fair Value 10,875 6,294
Held to maturity, Amortized Cost 4,973 6,332
Held to maturity, Gross Unrealized Gains 87 166
Held to maturity, Gross Unrealized Losses 224 160
Held to maturity, Fair Value $ 4,836 $ 6,338
[1] Substantially composed of securities guaranteed by the federal government with respect to the payment of principal and interest.