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Investment Securities (Schedule Of Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost $ 106,223 $ 100,013
Available For Sale, Gross Unrealized Gains 1,584 1,471
Available for sale, Gross Unrealized Losses 1,429 1,652
Available for sale, Fair Value 106,378 99,832
Held to maturity, Amortized Cost 7,807 9,321
Held to maturity, Gross Unrealized Gains 331 344
Held to maturity, Gross Unrealized Losses 204 303
Held to maturity, Fair Value 7,934 9,362
US Treasury and Federal Agencies, Mortgage-backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 206 265
Held to maturity, Gross Unrealized Gains 15 18
Held to maturity, Fair Value 221 283
Asset-backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 17 31
Held to maturity, Gross Unrealized Gains 0 0
Held to maturity, Gross Unrealized Losses 1 2
Held to maturity, Fair Value 16 29
Non-US Debt Securities, Mortgage-Backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 4,087 4,973
Held to maturity, Gross Unrealized Gains 73 87
Held to maturity, Gross Unrealized Losses 162 224
Held to maturity, Fair Value 3,998 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 432 436
Held to maturity, Gross Unrealized Gains 14 16
Held to maturity, Gross Unrealized Losses 3 3
Held to maturity, Fair Value 443 449
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 166 172
Held to maturity, Gross Unrealized Gains 0 0
Held to maturity, Gross Unrealized Losses 12 17
Held to maturity, Fair Value 154 155
Non U S Debt Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 4,688 5,584
Held to maturity, Gross Unrealized Gains 87 103
Held to maturity, Gross Unrealized Losses 177 244
Held to maturity, Fair Value 4,598 5,443
State And Political Subdivisions [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 86 107
Held to maturity, Gross Unrealized Gains 2 3
Held to maturity, Gross Unrealized Losses 0 0
Held to maturity, Fair Value 88 110
Collateralized Mortgage Obligations [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Held to maturity, Amortized Cost 2,810 3,334
Held to maturity, Gross Unrealized Gains 227 220
Held to maturity, Gross Unrealized Losses 26 57
Held to maturity, Fair Value 3,011 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 1,258 2,798
Available For Sale, Gross Unrealized Gains 32 39
Available for sale, Gross Unrealized Losses 1 1
Available for sale, Fair Value 1,289 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 33,679 29,511
Available For Sale, Gross Unrealized Gains 568 538
Available for sale, Gross Unrealized Losses 98 28
Available for sale, Fair Value 34,149 30,021
Asset-backed Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 32,555 32,905
Available For Sale, Gross Unrealized Gains 280 293
Available for sale, Gross Unrealized Losses 1,117 1,297
Available for sale, Fair Value 31,718 31,901
Asset-backed Securities, Student Loans [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 17,304 [1] 17,187 [1]
Available For Sale, Gross Unrealized Gains 79 [1] 69 [1]
Available for sale, Gross Unrealized Losses 648 [1] 711 [1]
Available for sale, Fair Value 16,735 [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 9,750 10,448
Available For Sale, Gross Unrealized Gains 54 53
Available for sale, Gross Unrealized Losses 8 14
Available for sale, Fair Value 9,796 10,487
Asset-backed Securities, Sub-prime [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 1,689 1,849
Available For Sale, Gross Unrealized Gains 2 2
Available for sale, Gross Unrealized Losses 361 447
Available for sale, Fair Value 1,330 1,404
Asset-backed Securities, Other [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 3,812 3,421
Available For Sale, Gross Unrealized Gains 145 169
Available for sale, Gross Unrealized Losses 100 125
Available for sale, Fair Value 3,857 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 10,747 10,890
Available For Sale, Gross Unrealized Gains 119 92
Available for sale, Gross Unrealized Losses 51 107
Available for sale, Fair Value 10,815 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 5,641 4,318
Available For Sale, Gross Unrealized Gains 10 2
Available for sale, Gross Unrealized Losses 9 17
Available for sale, Fair Value 5,642 4,303
Non-US Debt Securities, Government Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 1,821 1,671
Available For Sale, Gross Unrealized Gains 0 0
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value 1,821 1,671
Non-US Debt Securities, Other [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 3,625 2,797
Available For Sale, Gross Unrealized Gains 53 41
Available for sale, Gross Unrealized Losses 5 13
Available for sale, Fair Value 3,673 2,825
Non U S Debt Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 21,834 19,676
Available For Sale, Gross Unrealized Gains 182 135
Available for sale, Gross Unrealized Losses 65 137
Available for sale, Fair Value 21,951 19,674
State And Political Subdivisions [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 7,182 6,924
Available For Sale, Gross Unrealized Gains 229 244
Available for sale, Gross Unrealized Losses 103 121
Available for sale, Fair Value 7,308 7,047
Collateralized Mortgage Obligations [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 4,668 3,971
Available For Sale, Gross Unrealized Gains 98 62
Available for sale, Gross Unrealized Losses 36 53
Available for sale, Fair Value 4,730 3,980
Other U.S. Debt Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 4,265 3,471
Available For Sale, Gross Unrealized Gains 193 159
Available for sale, Gross Unrealized Losses 9 15
Available for sale, Fair Value 4,449 3,615
U.S. Equity Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 674 639
Available For Sale, Gross Unrealized Gains 2 1
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value 676 640
Non-US Equity Securities [Member]
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available For Sale, Amortized Cost 108 118
Available For Sale, Gross Unrealized Gains 0 0
Available for sale, Gross Unrealized Losses 0 0
Available for sale, Fair Value $ 108 $ 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.