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Investment Securities (Schedule Of Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost $ 106,141 $ 100,013
Available For Sale, Gross Unrealized Gains 2,078 1,471
Available for sale, Gross Unrealized Losses 1,090 1,652
Available for sale, Fair Value 107,129 99,832
Held to maturity, Amortized Cost 8,360 9,321
Held to maturity, Gross Unrealized Gains 372 344
Held to maturity, Gross Unrealized Losses 110 303
Held to maturity, Fair Value 8,622 9,362
US Treasury and Federal Agencies, Direct Obligations [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 1,500  
Held to maturity, Fair Value 1,500  
US Treasury and Federal Agencies, Mortgage-backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 180 265
Held to maturity, Gross Unrealized Gains 13 18
Held to maturity, Fair Value 193 283
Asset-backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 8 31
Held to maturity, Gross Unrealized Gains 0 0
Held to maturity, Gross Unrealized Losses    2
Held to maturity, Fair Value 8 29
Non-US Debt Securities, Mortgage-Backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 3,409 4,973
Held to maturity, Gross Unrealized Gains 71 87
Held to maturity, Gross Unrealized Losses 93 224
Held to maturity, Fair Value 3,387 4,836
Non-US Debt Securities, Asset-Backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 441 436
Held to maturity, Gross Unrealized Gains 14 16
Held to maturity, Gross Unrealized Losses 2 3
Held to maturity, Fair Value 453 449
Non-US Debt Securities, Government Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
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-US Debt Securities, Other [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 165 172
Held to maturity, Gross Unrealized Gains 0 0
Held to maturity, Gross Unrealized Losses 3 17
Held to maturity, Fair Value 162 155
Non U S Debt Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 4,018 5,584
Held to maturity, Gross Unrealized Gains 85 103
Held to maturity, Gross Unrealized Losses 98 244
Held to maturity, Fair Value 4,005 5,443
State And Political Subdivisions [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 80 107
Held to maturity, Gross Unrealized Gains 2 3
Held to maturity, Gross Unrealized Losses 0 0
Held to maturity, Fair Value 82 110
Collateralized Mortgage Obligations [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 2,574 3,334
Held to maturity, Gross Unrealized Gains 272 220
Held to maturity, Gross Unrealized Losses 12 57
Held to maturity, Fair Value 2,834 3,497
US Treasury and Federal Agencies, Direct Obligations [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 852 2,798
Available For Sale, Gross Unrealized Gains 19 39
Available for sale, Gross Unrealized Losses 1 1
Available for sale, Fair Value 870 2,836
US Treasury and Federal Agencies, Mortgage-backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 31,355 29,511
Available For Sale, Gross Unrealized Gains 672 538
Available for sale, Gross Unrealized Losses 24 28
Available for sale, Fair Value 32,003 30,021
Asset-backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 32,630 32,905
Available For Sale, Gross Unrealized Gains 301 293
Available for sale, Gross Unrealized Losses 923 1,297
Available for sale, Fair Value 32,008 31,901
Asset-backed Securities, Student Loans [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 17,039 [1] 17,187 [1]
Available For Sale, Gross Unrealized Gains 89 [1] 69 [1]
Available for sale, Gross Unrealized Losses 591 [1] 711 [1]
Available for sale, Fair Value 16,537 [1] 16,545 [1]
Asset-backed Securities, Credit Cards [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 9,906 10,448
Available For Sale, Gross Unrealized Gains 64 53
Available for sale, Gross Unrealized Losses 4 14
Available for sale, Fair Value 9,966 10,487
Asset-backed Securities, Sub-prime [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 1,618 1,849
Available For Sale, Gross Unrealized Gains 3 2
Available for sale, Gross Unrealized Losses 242 447
Available for sale, Fair Value 1,379 1,404
Asset-backed Securities, Other [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 4,067 3,421
Available For Sale, Gross Unrealized Gains 145 169
Available for sale, Gross Unrealized Losses 86 125
Available for sale, Fair Value 4,126 3,465
Non-US Debt Securities, Mortgage-Backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 10,770 10,890
Available For Sale, Gross Unrealized Gains 304 92
Available for sale, Gross Unrealized Losses 30 107
Available for sale, Fair Value 11,044 10,875
Non-US Debt Securities, Asset-Backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 5,896 4,318
Available For Sale, Gross Unrealized Gains 28 2
Available for sale, Gross Unrealized Losses 4 17
Available for sale, Fair Value 5,920 4,303
Non-US Debt Securities, Government Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 2,985 1,671
Available For Sale, Gross Unrealized Gains 1 0
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value 2,986 1,671
Non-US Debt Securities, Other [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 3,955 2,797
Available For Sale, Gross Unrealized Gains 80 41
Available for sale, Gross Unrealized Losses 1 13
Available for sale, Fair Value 4,034 2,825
Non U S Debt Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 23,606 19,676
Available For Sale, Gross Unrealized Gains 413 135
Available for sale, Gross Unrealized Losses 35 137
Available for sale, Fair Value 23,984 19,674
State And Political Subdivisions [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 7,127 6,924
Available For Sale, Gross Unrealized Gains 258 244
Available for sale, Gross Unrealized Losses 81 121
Available for sale, Fair Value 7,304 7,047
Collateralized Mortgage Obligations [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 4,703 3,971
Available For Sale, Gross Unrealized Gains 160 62
Available for sale, Gross Unrealized Losses 18 53
Available for sale, Fair Value 4,845 3,980
Other U.S. Debt Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 4,861 3,471
Available For Sale, Gross Unrealized Gains 251 159
Available for sale, Gross Unrealized Losses 8 15
Available for sale, Fair Value 5,104 3,615
U.S. Equity Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 877 639
Available For Sale, Gross Unrealized Gains 4 1
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value 881 640
Non-US Equity Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 130 118
Available For Sale, Gross Unrealized Gains 0 0
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value $ 130 $ 118
[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.