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Investment Securities (Schedule Of Marketable Securities) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Available for sale, Amortized Cost$ 96,573$ 82,329
Available for sale, Gross Unrealized Gains1,5921,126
Available for sale, Gross Unrealized Losses1,5701,574
Available for sale, Fair Value96,59581,881
Held to maturity, Amortized Cost10,01812,249
Held to maturity, Gross Unrealized Gains379541
Held to maturity, Gross Unrealized Losses295214
Held to maturity, Fair Value10,10212,576
Asset-Backed Securities [Member] | U.S. Treasury And Federal Agencies [Member]
  
Available for sale, Amortized Cost32,78027,264
Available for sale, Gross Unrealized Gains314326
Available for sale, Gross Unrealized Losses1,2421,185
Available for sale, Fair Value31,85226,405
Held to maturity, Amortized Cost3864
Held to maturity, Gross Unrealized Gains  
Held to maturity, Gross Unrealized Losses45
Held to maturity, Fair Value3459
Sub-Prime [Member] | U.S. Treasury And Federal Agencies [Member]
  
Available for sale, Amortized Cost1,9312,161
Available for sale, Gross Unrealized Gains23
Available for sale, Gross Unrealized Losses447346
Available for sale, Fair Value1,4861,818
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
  
Available for sale, Amortized Cost5,2877,505
Available for sale, Gross Unrealized Gains8074
Available for sale, Gross Unrealized Losses22
Available for sale, Fair Value5,3657,577
U.S. Treasury And Federal Agencies [Member] | Student Loans [Member]
  
Available for sale, Amortized Cost17,111[1]14,975[1]
Available for sale, Gross Unrealized Gains80[1]92[1]
Available for sale, Gross Unrealized Losses658[1]652[1]
Available for sale, Fair Value16,533[1]14,415[1]
U.S. Treasury And Federal Agencies [Member] | Credit Cards [Member]
  
Available for sale, Amortized Cost10,4507,578
Available for sale, Gross Unrealized Gains6056
Available for sale, Gross Unrealized Losses1531
Available for sale, Fair Value10,4957,603
U.S. Treasury And Federal Agencies [Member] | Other Asset-Backed Securities [Member]
  
Available for sale, Amortized Cost3,2882,550
Available for sale, Gross Unrealized Gains172175
Available for sale, Gross Unrealized Losses122156
Available for sale, Fair Value3,3382,569
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
  
Available for sale, Amortized Cost27,37323,398
Available for sale, Gross Unrealized Gains660325
Available for sale, Gross Unrealized Losses783
Available for sale, Fair Value28,02623,640
Held to maturity, Amortized Cost299413
Held to maturity, Gross Unrealized Gains2126
Held to maturity, Fair Value320439
Asset-Backed Securities [Member] | Non-U.S. Debt Securities [Member]
  
Available for sale, Amortized Cost3,7901,790
Available for sale, Gross Unrealized Gains213
Available for sale, Gross Unrealized Losses1117
Available for sale, Fair Value3,7811,786
Held to maturity, Amortized Cost574646
Held to maturity, Gross Unrealized Gains1618
Held to maturity, Gross Unrealized Losses33
Held to maturity, Fair Value587661
Non-U.S. Debt Securities [Member] | Non-U.S. Debt Securities [Member]
  
Available for sale, Amortized Cost17,23311,953
Available for sale, Gross Unrealized Gains143129
Available for sale, Gross Unrealized Losses9065
Available for sale, Fair Value17,28612,017
Held to maturity, Amortized Cost5,9447,186
Held to maturity, Gross Unrealized Gains128184
Held to maturity, Gross Unrealized Losses234165
Held to maturity, Fair Value5,8387,205
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
  
Available for sale, Amortized Cost1,066990
Available for sale, Gross Unrealized Gains4234
Available for sale, Gross Unrealized Losses92
Available for sale, Fair Value1,0991,022
Held to maturity, Amortized Cost193208
Held to maturity, Gross Unrealized Gains  
Held to maturity, Gross Unrealized Losses162
Held to maturity, Fair Value177206
Non-U.S. Debt Securities [Member] | Government Securities [Member]
  
Available for sale, Amortized Cost3,0142,915
Available for sale, Gross Unrealized Gains  
Available for sale, Gross Unrealized Losses  
Available for sale, Fair Value3,0142,915
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
  
Available for sale, Amortized Cost9,3636,258
Available for sale, Gross Unrealized Gains9982
Available for sale, Gross Unrealized Losses7046
Available for sale, Fair Value9,3926,294
Held to maturity, Amortized Cost5,1746,332
Held to maturity, Gross Unrealized Gains112166
Held to maturity, Gross Unrealized Losses215160
Held to maturity, Fair Value5,0716,338
State And Political Subdivisions [Member]
  
Available for sale, Amortized Cost6,8536,706
Available for sale, Gross Unrealized Gains198102
Available for sale, Gross Unrealized Losses155204
Available for sale, Fair Value6,8966,604
Held to maturity, Amortized Cost113134
Held to maturity, Gross Unrealized Gains33
Held to maturity, Gross Unrealized Losses  
Held to maturity, Fair Value116137
Collateralized Mortgage Obligations [Member]
  
Available for sale, Amortized Cost3,1051,828
Available for sale, Gross Unrealized Gains4649
Available for sale, Gross Unrealized Losses5916
Available for sale, Fair Value3,0921,861
Held to maturity, Amortized Cost3,6244,452
Held to maturity, Gross Unrealized Gains227328
Held to maturity, Gross Unrealized Losses5744
Held to maturity, Fair Value3,7944,736
Other U.S. Debt Securities [Member]
  
Available for sale, Amortized Cost3,1272,438
Available for sale, Gross Unrealized Gains148116
Available for sale, Gross Unrealized Losses1418
Available for sale, Fair Value3,2612,536
U.S. Equity Securities [Member]
  
Available for sale, Amortized Cost6061,115
Available for sale, Gross Unrealized Gains2 
Available for sale, Gross Unrealized Losses  
Available for sale, Fair Value6081,115
Non-U.S. Equity Securities [Member]
  
Available for sale, Amortized Cost209122
Available for sale, Gross Unrealized Gains15
Available for sale, Gross Unrealized Losses11
Available for sale, Fair Value$ 209$ 126
[1] Substantially composed of securities guaranteed by the federal government with respect to the payment of principal and interest.