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Securities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities $ 58,804 $ 51,791
Unrealized Gain, Available-for-sale securities 1,927 [1] 1,840
Unrealized Losses, Available-for-sale securities (228) (350)
Fair Value, Available-for-sale securities 60,503 53,281
Amortized Cost, Held-to-maturity securities 1,844 2,035
Unrealized Gain, Held-to-maturity securities 237 264
Unrealized Losses, Held-to-maturity securities (1) (1)
Fair Value, Held-to-maturity securities 2,080 2,298
U.S. Treasury [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 27,886 18,199
Unrealized Gain, Available-for-sale securities 517 498
Unrealized Losses, Available-for-sale securities (50) (121)
Fair Value, Available-for-sale securities 28,353 18,576
Mortgage-backed securities, US Government sponsored enterprises [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 37 40
Unrealized Gain, Available-for-sale securities 1 1
Fair Value, Available-for-sale securities 38 41
Amortized Cost, Held-to-maturity securities 1,290 1,421
Unrealized Gain, Held-to-maturity securities 168 195
Fair Value, Held-to-maturity securities 1,458 1,616
Direct agency obligations, US Government sponsored enterprises [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 3,127 2,501
Unrealized Gain, Available-for-sale securities 387 352
Unrealized Losses, Available-for-sale securities (1)  
Fair Value, Available-for-sale securities 3,513 2,853
Mortgage-backed securities, US Government agency issued or guaranteed [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 14,774 15,357
Unrealized Gain, Available-for-sale securities 755 728
Unrealized Losses, Available-for-sale securities   (3)
Fair Value, Available-for-sale securities 15,529 16,082
Amortized Cost, Held-to-maturity securities 72 79
Unrealized Gain, Held-to-maturity securities 13 13
Fair Value, Held-to-maturity securities 85 92
Collateralized mortgage obligations, US Government agency issued or guaranteed [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 4,499 6,881
Unrealized Gain, Available-for-sale securities 170 177
Unrealized Losses, Available-for-sale securities (1) (3)
Fair Value, Available-for-sale securities 4,668 7,055
Amortized Cost, Held-to-maturity securities 289 308
Unrealized Gain, Held-to-maturity securities 43 44
Fair Value, Held-to-maturity securities 332 352
Direct agency obligations, US Government agency issued or guaranteed [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 1 2
Fair Value, Available-for-sale securities 1 2
Obligations of U.S. states and political subdivisions [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 646 566
Unrealized Gain, Available-for-sale securities 35 35
Unrealized Losses, Available-for-sale securities   (1)
Fair Value, Available-for-sale securities 681 600
Amortized Cost, Held-to-maturity securities 47 61
Unrealized Gain, Held-to-maturity securities 3 3
Fair Value, Held-to-maturity securities 50 64
Residential mortgage backed securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 5 6
Unrealized Losses, Available-for-sale securities   (1)
Fair Value, Available-for-sale securities 5 5
Amortized Cost, Held-to-maturity securities 146 166
Unrealized Gain, Held-to-maturity securities 10 9
Unrealized Losses, Held-to-maturity securities (1) (1)
Fair Value, Held-to-maturity securities 155 174
Commercial mortgages backed securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 299 444
Unrealized Gain, Available-for-sale securities 7 9
Unrealized Losses, Available-for-sale securities (1) (2)
Fair Value, Available-for-sale securities 305 451
Home equity backed securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 338 369
Unrealized Losses, Available-for-sale securities (87) (99)
Fair Value, Available-for-sale securities 251 270
Student loans backed securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 10 13
Unrealized Losses, Available-for-sale securities (1) (1)
Fair Value, Available-for-sale securities 9 12
Other securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 102 102
Unrealized Losses, Available-for-sale securities (17) (22)
Fair Value, Available-for-sale securities 85 80
Corporate and Other Domestic Debt Securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 40 541
Unrealized Gain, Available-for-sale securities 2 3
Fair Value, Available-for-sale securities 42 544
Foreign debt securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 6,869 6,640
Unrealized Gain, Available-for-sale securities 31 27
Unrealized Losses, Available-for-sale securities (70) (97)
Fair Value, Available-for-sale securities 6,830 6,570
Equity Securities [Member]
   
Amortized Cost and Fair Value of Securities available for Sale and Held to Maturity    
Amortized Cost, Available-for-sale securities 171 130
Unrealized Gain, Available-for-sale securities 22 10
Fair Value, Available-for-sale securities $ 193 $ 140
[1] The following table summarizes assets and liabilities related to variable interest entities ("VIEs") as of June 30, 2012 and December 31, 2011 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation.