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Investment Securities (Schedule Of Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Available for sale, Amortized Cost $ 104,589 $ 100,013
Available for sale, Gross Unrealized Gains 1,609 1,471
Available for sale, Gross Unrealized Losses 1,494 1,652
Available for sale, Fair Value 104,704 99,832
Held to maturity, Amortized Cost 8,668 9,321
Held to maturity, Gross Unrealized Gains 391 344
Held to maturity, Gross Unrealized Losses 217 303
Held to maturity, Fair Value 8,842 9,362
State And Political Subdivisions [Member]
   
Available for sale, Amortized Cost 7,066 6,924
Available for sale, Gross Unrealized Gains 226 244
Available for sale, Gross Unrealized Losses 104 121
Available for sale, Fair Value 7,188 7,047
Held to maturity, Amortized Cost 89 107
Held to maturity, Gross Unrealized Gains 2 3
Held to maturity, Gross Unrealized Losses 0 0
Held to maturity, Fair Value 91 110
Collateralized Mortgage Obligations [Member]
   
Available for sale, Amortized Cost 4,222 3,971
Available for sale, Gross Unrealized Gains 96 62
Available for sale, Gross Unrealized Losses 39 53
Available for sale, Fair Value 4,279 3,980
Held to maturity, Amortized Cost 3,041 3,334
Held to maturity, Gross Unrealized Gains 261 220
Held to maturity, Gross Unrealized Losses 22 57
Held to maturity, Fair Value 3,280 3,497
Other U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 3,885 3,471
Available for sale, Gross Unrealized Gains 179 159
Available for sale, Gross Unrealized Losses 13 15
Available for sale, Fair Value 4,051 3,615
U.S. Equity Securities [Member]
   
Available for sale, Amortized Cost 670 639
Available for sale, Gross Unrealized Gains 3 1
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value 673 640
Non-U.S. Equity Securities [Member]
   
Available for sale, Amortized Cost 120 118
Available for sale, Gross Unrealized Gains 0 0
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value 120 118
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
   
Available for sale, Amortized Cost 1,693 2,798
Available for sale, Gross Unrealized Gains 32 39
Available for sale, Gross Unrealized Losses 1 1
Available for sale, Fair Value 1,724 2,836
U.S. Treasury And Federal Agencies [Member] | Student Loans [Member]
   
Available for sale, Amortized Cost 17,404 [1] 17,187 [1]
Available for sale, Gross Unrealized Gains 66 [1] 69 [1]
Available for sale, Gross Unrealized Losses 703 [1] 711 [1]
Available for sale, Fair Value 16,767 [1] 16,545 [1]
U.S. Treasury And Federal Agencies [Member] | Credit Cards [Member]
   
Available for sale, Amortized Cost 10,151 10,448
Available for sale, Gross Unrealized Gains 64 53
Available for sale, Gross Unrealized Losses 5 14
Available for sale, Fair Value 10,210 10,487
U.S. Treasury And Federal Agencies [Member] | Sub-Prime [Member]
   
Available for sale, Amortized Cost 1,767 1,849
Available for sale, Gross Unrealized Gains 2 2
Available for sale, Gross Unrealized Losses 390 447
Available for sale, Fair Value 1,379 1,404
U.S. Treasury And Federal Agencies [Member] | Other Asset-Backed Securities [Member]
   
Available for sale, Amortized Cost 3,625 3,421
Available for sale, Gross Unrealized Gains 166 169
Available for sale, Gross Unrealized Losses 112 125
Available for sale, Fair Value 3,679 3,465
U.S. Treasury And Federal Agencies [Member] | Asset-Backed Securities [Member]
   
Available for sale, Amortized Cost 32,947 32,905
Available for sale, Gross Unrealized Gains 298 293
Available for sale, Gross Unrealized Losses 1,210 1,297
Available for sale, Fair Value 32,035 31,901
Held to maturity, Amortized Cost 25 31
Held to maturity, Gross Unrealized Gains 0 0
Held to maturity, Gross Unrealized Losses 1 2
Held to maturity, Fair Value 24 29
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
   
Available for sale, Amortized Cost 32,179 29,511
Available for sale, Gross Unrealized Gains 586 538
Available for sale, Gross Unrealized Losses 48 28
Available for sale, Fair Value 32,717 30,021
Held to maturity, Amortized Cost 235 265
Held to maturity, Gross Unrealized Gains 17 18
Held to maturity, Fair Value 252 283
Non-U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 21,807 19,676
Available for sale, Gross Unrealized Gains 189 135
Available for sale, Gross Unrealized Losses 79 137
Available for sale, Fair Value 21,917 19,674
Held to maturity, Amortized Cost 5,278 5,584
Held to maturity, Gross Unrealized Gains 111 103
Held to maturity, Gross Unrealized Losses 194 244
Held to maturity, Fair Value 5,195 5,443
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
   
Available for sale, Amortized Cost 4,963 4,318
Available for sale, Gross Unrealized Gains 6 2
Available for sale, Gross Unrealized Losses 9 17
Available for sale, Fair Value 4,960 4,303
Held to maturity, Amortized Cost 439 436
Held to maturity, Gross Unrealized Gains 14 16
Held to maturity, Gross Unrealized Losses 2 3
Held to maturity, Fair Value 451 449
Non-U.S. Debt Securities [Member] | Government Securities [Member]
   
Available for sale, Amortized Cost 1,703 1,671
Available for sale, Gross Unrealized Gains 0 0
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value 1,703 1,671
Held to maturity, Amortized Cost 3 3
Held to maturity, Gross Unrealized Gains 0 0
Held to maturity, Gross Unrealized Losses 0 0
Held to maturity, Fair Value 3 3
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
   
Available for sale, Amortized Cost 3,634 2,797
Available for sale, Gross Unrealized Gains 51 41
Available for sale, Gross Unrealized Losses 2 13
Available for sale, Fair Value 3,683 2,825
Held to maturity, Amortized Cost 176 172
Held to maturity, Gross Unrealized Gains 0 0
Held to maturity, Gross Unrealized Losses 5 17
Held to maturity, Fair Value 171 155
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
   
Available for sale, Amortized Cost 11,507 10,890
Available for sale, Gross Unrealized Gains 132 92
Available for sale, Gross Unrealized Losses 68 107
Available for sale, Fair Value 11,571 10,875
Held to maturity, Amortized Cost 4,660 4,973
Held to maturity, Gross Unrealized Gains 97 87
Held to maturity, Gross Unrealized Losses 187 224
Held to maturity, Fair Value $ 4,570 $ 4,836
[1] Substantially composed of securities guaranteed by the federal government with respect to at least 97% of defaulted principal and accrued interest on the underlying loans.