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Investment Securities (Schedule Of Gross Pre-Tax Unrealized Losses On Investment Securities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Direct Obligations [Member]
   
Available for sale, Fair Value Less than 12 months $ 136 $ 1,373
Available for sale, Gross Unrealized Losses Less than 12 months 1 1
Available for sale, Fair Value 12 months or longer     
Available for sale, Gross Unrealized Losses 12 months or longer     
Available for sale, Fair Value Total 136 1,373
Available for sale, Gross Unrealized Losses Total 1 1
Mortgage-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 months 6,017 4,714
Available for sale, Gross Unrealized Losses Less than 12 months 46 26
Available for sale, Fair Value 12 months or longer 340 370
Available for sale, Gross Unrealized Losses 12 months or longer 2 2
Available for sale, Fair Value Total 6,357 5,084
Available for sale, Gross Unrealized Losses Total 48 28
Student Loans [Member]
   
Available for sale, Fair Value Less than 12 months 2,567 2,642
Available for sale, Gross Unrealized Losses Less than 12 months 22 23
Available for sale, Fair Value 12 months or longer 10,813 10,706
Available for sale, Gross Unrealized Losses 12 months or longer 681 688
Available for sale, Fair Value Total 13,380 13,348
Available for sale, Gross Unrealized Losses Total 703 711
Credit Cards [Member]
   
Available for sale, Fair Value Less than 12 months 731 2,581
Available for sale, Gross Unrealized Losses Less than 12 months 1 6
Available for sale, Fair Value 12 months or longer 693 1,461
Available for sale, Gross Unrealized Losses 12 months or longer 4 8
Available for sale, Fair Value Total 1,424 4,042
Available for sale, Gross Unrealized Losses Total 5 14
Sub-Prime [Member]
   
Available for sale, Fair Value Less than 12 months 7 16
Available for sale, Gross Unrealized Losses Less than 12 months 1 1
Available for sale, Fair Value 12 months or longer 1,336 1,360
Available for sale, Gross Unrealized Losses 12 months or longer 389 446
Available for sale, Fair Value Total 1,343 1,376
Available for sale, Gross Unrealized Losses Total 390 447
Other Asset-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 months 1,080 1,482
Available for sale, Gross Unrealized Losses Less than 12 months 24 19
Available for sale, Fair Value 12 months or longer 1,106 1,122
Available for sale, Gross Unrealized Losses 12 months or longer 88 106
Available for sale, Fair Value Total 2,186 2,604
Available for sale, Gross Unrealized Losses Total 112 125
Asset-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 months 4,385 6,721
Available for sale, Gross Unrealized Losses Less than 12 months 48 49
Available for sale, Fair Value 12 months or longer 13,948 14,649
Available for sale, Gross Unrealized Losses 12 months or longer 1,162 1,248
Available for sale, Fair Value Total 18,333 21,370
Available for sale, Gross Unrealized Losses Total 1,210 1,297
Held to maturity, Fair Value 12 months or longer 24 29
Held to maturity, Gross Unrealized Losses 12 months or longer 1 2
Held to maturity, Fair Value Total 24 29
Held to maturity, Gross Unrealized Losses Total 1 2
State And Political Subdivisions [Member]
   
Available for sale, Fair Value Less than 12 months 356 171
Available for sale, Gross Unrealized Losses Less than 12 months 3 3
Available for sale, Fair Value 12 months or longer 1,385 1,446
Available for sale, Gross Unrealized Losses 12 months or longer 101 118
Available for sale, Fair Value Total 1,741 1,617
Available for sale, Gross Unrealized Losses Total 104 121
Collateralized Mortgage Obligations [Member]
   
Available for sale, Fair Value Less than 12 months 1,305 2,024
Available for sale, Gross Unrealized Losses Less than 12 months 27 43
Available for sale, Fair Value 12 months or longer 246 68
Available for sale, Gross Unrealized Losses 12 months or longer 12 10
Available for sale, Fair Value Total 1,551 2,092
Available for sale, Gross Unrealized Losses Total 39 53
Held to maturity, Fair Value Less than 12 months 218 649
Held to maturity, Gross Unrealized Losses Less than 12 months 6 32
Held to maturity, Fair Value 12 months or longer 224 231
Held to maturity, Gross Unrealized Losses 12 months or longer 16 25
Held to maturity, Fair Value Total 442 880
Held to maturity, Gross Unrealized Losses Total 22 57
Other U.S. Debt Securities [Member]
   
Available for sale, Fair Value Less than 12 months 362 220
Available for sale, Gross Unrealized Losses Less than 12 months 2 2
Available for sale, Fair Value 12 months or longer 39 57
Available for sale, Gross Unrealized Losses 12 months or longer 11 13
Available for sale, Fair Value Total 401 277
Available for sale, Gross Unrealized Losses Total 13 15
Total AFS Securities [Member]
   
Available for sale, Fair Value Less than 12 months 18,386 25,040
Available for sale, Gross Unrealized Losses Less than 12 months 157 206
Available for sale, Fair Value 12 months or longer 17,433 17,849
Available for sale, Gross Unrealized Losses 12 months or longer 1,337 1,446
Available for sale, Fair Value Total 35,819 42,889
Available for sale, Gross Unrealized Losses Total 1,494 1,652
Total HTM Securities [Member]
   
Held to maturity, Fair Value Less than 12 months 397 999
Held to maturity, Gross Unrealized Losses Less than 12 months 9 39
Held to maturity, Fair Value 12 months or longer 1,834 1,850
Held to maturity, Gross Unrealized Losses 12 months or longer 208 264
Held to maturity, Fair Value Total 2,231 2,849
Held to maturity, Gross Unrealized Losses Total 217 303
Non-U.S. Debt Securities [Member]
   
Available for sale, Fair Value Less than 12 months 5,825 9,817
Available for sale, Gross Unrealized Losses Less than 12 months 30 82
Available for sale, Fair Value 12 months or longer 1,475 1,259
Available for sale, Gross Unrealized Losses 12 months or longer 49 55
Available for sale, Fair Value Total 7,300 11,076
Available for sale, Gross Unrealized Losses Total 79 137
Held to maturity, Fair Value Less than 12 months 179 350
Held to maturity, Gross Unrealized Losses Less than 12 months 3 7
Held to maturity, Fair Value 12 months or longer 1,586 1,590
Held to maturity, Gross Unrealized Losses 12 months or longer 191 237
Held to maturity, Fair Value Total 1,765 1,940
Held to maturity, Gross Unrealized Losses Total 194 244
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 months 4,319 6,069
Available for sale, Gross Unrealized Losses Less than 12 months 25 55
Available for sale, Fair Value 12 months or longer 1,089 1,151
Available for sale, Gross Unrealized Losses 12 months or longer 43 52
Available for sale, Fair Value Total 5,408 7,220
Available for sale, Gross Unrealized Losses Total 68 107
Held to maturity, Fair Value Less than 12 months 170 341
Held to maturity, Gross Unrealized Losses Less than 12 months 2 6
Held to maturity, Fair Value 12 months or longer 1,359 1,382
Held to maturity, Gross Unrealized Losses 12 months or longer 185 218
Held to maturity, Fair Value Total 1,529 1,723
Held to maturity, Gross Unrealized Losses Total 187 224
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
   
Available for sale, Fair Value Less than 12 months 395 1,543
Available for sale, Gross Unrealized Losses Less than 12 months 2 13
Available for sale, Fair Value 12 months or longer 0 0
Available for sale, Gross Unrealized Losses 12 months or longer 0 0
Available for sale, Fair Value Total 395 1,543
Available for sale, Gross Unrealized Losses Total 2 13
Held to maturity, Fair Value Less than 12 months 0 0
Held to maturity, Gross Unrealized Losses Less than 12 months 0 0
Held to maturity, Fair Value 12 months or longer 155 138
Held to maturity, Gross Unrealized Losses 12 months or longer 5 17
Held to maturity, Fair Value Total 155 138
Held to maturity, Gross Unrealized Losses Total 5 17
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 months 1,111 2,205
Available for sale, Gross Unrealized Losses Less than 12 months 3 14
Available for sale, Fair Value 12 months or longer 386 108
Available for sale, Gross Unrealized Losses 12 months or longer 6 3
Available for sale, Fair Value Total 1,497 2,313
Available for sale, Gross Unrealized Losses Total 9 17
Held to maturity, Fair Value Less than 12 months 9 9
Held to maturity, Gross Unrealized Losses Less than 12 months 1 1
Held to maturity, Fair Value 12 months or longer 72 70
Held to maturity, Gross Unrealized Losses 12 months or longer 1 2
Held to maturity, Fair Value Total 81 79
Held to maturity, Gross Unrealized Losses Total $ 2 $ 3