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Investment Securities (Schedule Of Gross Pre-Tax Unrealized Losses On Investment Securities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Student Loans [Member]
   
Available for sale, Fair Value Less than 12 Months $ 2,642 $ 1,980
Available for sale, Gross Unrealized Losses Less than 12 Months 23 25
Available for sale, Fair Value 12 Months or Longer 10,706 8,457
Available for sale, Gross Unrealized Losses 12 Months or Longer 688 627
Available for sale, Fair Value Total 13,348 10,437
Available for sale, Gross Unrealized Losses Total 711 652
Credit Cards [Member]
   
Available for sale, Fair Value Less than 12 Months 2,581 1,268
Available for sale, Gross Unrealized Losses Less than 12 Months 6 5
Available for sale, Fair Value 12 Months or Longer 1,461 2,396
Available for sale, Gross Unrealized Losses 12 Months or Longer 8 26
Available for sale, Fair Value Total 4,042 3,664
Available for sale, Gross Unrealized Losses Total 14 31
Sub-Prime [Member]
   
Available for sale, Fair Value Less than 12 Months 16   
Available for sale, Gross Unrealized Losses Less than 12 Months 1   
Available for sale, Fair Value 12 Months or Longer 1,360 1,769
Available for sale, Gross Unrealized Losses 12 Months or Longer 446 346
Available for sale, Fair Value Total 1,376 1,769
Available for sale, Gross Unrealized Losses Total 447 346
Other Asset-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 1,482 269
Available for sale, Gross Unrealized Losses Less than 12 Months 19 3
Available for sale, Fair Value 12 Months or Longer 1,122 1,122
Available for sale, Gross Unrealized Losses 12 Months or Longer 106 153
Available for sale, Fair Value Total 2,604 1,391
Available for sale, Gross Unrealized Losses Total 125 156
Asset-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 6,721 3,517
Available for sale, Gross Unrealized Losses Less than 12 Months 49 33
Available for sale, Fair Value 12 Months or Longer 14,649 13,744
Available for sale, Gross Unrealized Losses 12 Months or Longer 1,248 1,152
Available for sale, Fair Value Total 21,370 17,261
Available for sale, Gross Unrealized Losses Total 1,297 1,185
Held to maturity, Fair Value 12 Months or Longer 29 53
Held to maturity, Gross Unrealized Losses 12 Months or Longer 2 5
Held to maturity, Fair Value Total 29 53
Held to maturity, Gross Unrealized Losses Total 2 5
State And Political Subdivisions [Member]
   
Available for sale, Fair Value Less than 12 Months 171 1,097
Available for sale, Gross Unrealized Losses Less than 12 Months 3 19
Available for sale, Fair Value 12 Months or Longer 1,446 1,967
Available for sale, Gross Unrealized Losses 12 Months or Longer 118 185
Available for sale, Fair Value Total 1,617 3,064
Available for sale, Gross Unrealized Losses Total 121 204
Collateralized Mortgage Obligations [Member]
   
Available for sale, Fair Value Less than 12 Months 2,024 494
Available for sale, Gross Unrealized Losses Less than 12 Months 43 5
Available for sale, Fair Value 12 Months or Longer 68 109
Available for sale, Gross Unrealized Losses 12 Months or Longer 10 11
Available for sale, Fair Value Total 2,092 603
Available for sale, Gross Unrealized Losses Total 53 16
Held to maturity, Fair Value Less than 12 Months 649 125
Held to maturity, Gross Unrealized Losses Less than 12 Months 32 2
Held to maturity, Fair Value 12 Months or Longer 231 575
Held to maturity, Gross Unrealized Losses 12 Months or Longer 25 42
Held to maturity, Fair Value Total 880 700
Held to maturity, Gross Unrealized Losses Total 57 44
Other U.S. Debt Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 220 330
Available for sale, Gross Unrealized Losses Less than 12 Months 2 7
Available for sale, Fair Value 12 Months or Longer 57 61
Available for sale, Gross Unrealized Losses 12 Months or Longer 13 11
Available for sale, Fair Value Total 277 391
Available for sale, Gross Unrealized Losses Total 15 18
Total AFS Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 25,040 15,054
Available for sale, Gross Unrealized Losses Less than 12 Months 206 170
Available for sale, Fair Value 12 Months or Longer 17,849 16,889
Available for sale, Gross Unrealized Losses 12 Months or Longer 1,446 1,404
Available for sale, Fair Value Total 42,889 31,943
Available for sale, Gross Unrealized Losses Total 1,652 1,574
Total HTM Securities [Member]
   
Held to maturity, Fair Value Less than 12 Months 999 1,776
Held to maturity, Gross Unrealized Losses Less than 12 Months 39 76
Held to maturity, Fair Value 12 Months or Longer 1,850 1,558
Held to maturity, Gross Unrealized Losses 12 Months or Longer 264 138
Held to maturity, Fair Value Total 2,849 3,334
Held to maturity, Gross Unrealized Losses Total 303 214
Non-U.S. Equity Securities [Member]
   
Available for sale, Fair Value Less than 12 Months   8
Available for sale, Gross Unrealized Losses Less than 12 Months   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   8
Available for sale, Gross Unrealized Losses Total   1
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
   
Available for sale, Fair Value Less than 12 Months 1,373  
Available for sale, Gross Unrealized Losses Less than 12 Months 1  
Available for sale, Fair Value 12 Months or Longer   153
Available for sale, Gross Unrealized Losses 12 Months or Longer   2
Available for sale, Fair Value Total 1,373 153
Available for sale, Gross Unrealized Losses Total 1 2
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 4,714 6,639
Available for sale, Gross Unrealized Losses Less than 12 Months 26 81
Available for sale, Fair Value 12 Months or Longer 370 431
Available for sale, Gross Unrealized Losses 12 Months or Longer 2 2
Available for sale, Fair Value Total 5,084 7,070
Available for sale, Gross Unrealized Losses Total 28 83
Non-U.S. Debt Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 9,817 2,969
Available for sale, Gross Unrealized Losses Less than 12 Months 82 24
Available for sale, Fair Value 12 Months or Longer 1,259 424
Available for sale, Gross Unrealized Losses 12 Months or Longer 55 41
Available for sale, Fair Value Total 11,076 3,393
Available for sale, Gross Unrealized Losses Total 137 65
Held to maturity, Fair Value Less than 12 Months 350 1,651
Held to maturity, Gross Unrealized Losses Less than 12 Months 7 74
Held to maturity, Fair Value 12 Months or Longer 1,590 930
Held to maturity, Gross Unrealized Losses 12 Months or Longer 237 91
Held to maturity, Fair Value Total 1,840 2,581
Held to maturity, Gross Unrealized Losses Total 244 165
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 6,069 2,621
Available for sale, Gross Unrealized Losses Less than 12 Months 55 22
Available for sale, Fair Value 12 Months or Longer 1,151 370
Available for sale, Gross Unrealized Losses 12 Months or Longer 52 24
Available for sale, Fair Value Total 7,220 2,991
Available for sale, Gross Unrealized Losses Total 107 46
Held to maturity, Fair Value Less than 12 Months 341 1,445
Held to maturity, Gross Unrealized Losses Less than 12 Months 6 72
Held to maturity, Fair Value 12 Months or Longer 1,382 862
Held to maturity, Gross Unrealized Losses 12 Months or Longer 218 88
Held to maturity, Fair Value Total 1,723 2,307
Held to maturity, Gross Unrealized Losses Total 224 160
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 1,543 348
Available for sale, Gross Unrealized Losses Less than 12 Months 13 2
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 1,543 348
Available for sale, Gross Unrealized Losses Total 13 2
Held to maturity, Fair Value Less than 12 Months   206
Held to maturity, Gross Unrealized Losses Less than 12 Months   2
Held to maturity, Fair Value 12 Months or Longer 138   
Held to maturity, Gross Unrealized Losses 12 Months or Longer 17   
Held to maturity, Fair Value Total 138 206
Held to maturity, Gross Unrealized Losses Total 17 2
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
   
Available for sale, Fair Value Less than 12 Months 2,205  
Available for sale, Gross Unrealized Losses Less than 12 Months 14  
Available for sale, Fair Value 12 Months or Longer 108 54
Available for sale, Gross Unrealized Losses 12 Months or Longer 3 17
Available for sale, Fair Value Total 2,313 54
Available for sale, Gross Unrealized Losses Total 17 17
Held to maturity, Fair Value Less than 12 Months 9   
Held to maturity, Gross Unrealized Losses Less than 12 Months 1   
Held to maturity, Fair Value 12 Months or Longer 70 68
Held to maturity, Gross Unrealized Losses 12 Months or Longer 2 3
Held to maturity, Fair Value Total 79 68
Held to maturity, Gross Unrealized Losses Total $ 3 $ 3