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Investment Securities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Held-to-maturity    
Amortized Cost $ 34,635 $ 18,877
Unrealized Gains 483 383
Unrealized Losses Other-than-Temporary (5) (6)
Unrealized Losses Other (32) (38)
Fair Value 35,081 19,216
Available-for-sale securities    
Amortized Cost 38,499 51,356
Unrealized Gains 1,255 1,272
Unrealized Losses Other-than-Temporary (245) (318)
Unrealized Losses Other (196) (373)
Fair Value 39,313 [1] 51,937 [1]
Other Investments [Member]
   
Available-for-sale securities    
Amortized Cost 220 188
Unrealized Gains 18 15
Unrealized Losses Other   (1)
Fair Value 238 202
U.S. Treasury and agencies [Member]
   
Available-for-sale securities    
Amortized Cost 786 1,045
Unrealized Gains 14 13
Unrealized Losses Other   (1)
Fair Value 800 1,057
Obligations of state and political subdivisions [Member]
   
Available-for-sale securities    
Amortized Cost 6,215 6,394
Unrealized Gains 298 167
Unrealized Losses Other (3) (22)
Fair Value 6,510 6,539
Obligations of foreign governments [Member]
   
Available-for-sale securities    
Amortized Cost 6 6
Fair Value 6 6
Asset backed Securities [Member]
   
Available-for-sale securities    
Amortized Cost 809  
Collateralized Debt/Loan Obligations [Member]
   
Available-for-sale securities    
Amortized Cost 128 180
Unrealized Gains 21 31
Unrealized Losses Other-than-Temporary (1) (3)
Unrealized Losses Other (4) (2)
Fair Value 144 206
Other [Member]
   
Available-for-sale securities    
Amortized Cost 681 694
Unrealized Gains 28 16
Unrealized Losses Other-than-Temporary (4) (5)
Unrealized Losses Other (9) (24)
Fair Value 696 681
Corporate Debt Securities [Member]
   
Available-for-sale securities    
Amortized Cost 951 1,000
Unrealized Gains   1
Unrealized Losses Other (120) (174)
Fair Value 831 827
Perpetual preferred securities [Member]
   
Available-for-sale securities    
Amortized Cost 333 379
Unrealized Gains 23 25
Unrealized Losses Other (25) (86)
Fair Value 331 318
Asset backed Securities [Member]
   
Held-to-maturity    
Amortized Cost 51  
Collateralized Debt/Loan Obligations [Member]
   
Held-to-maturity    
Amortized Cost 31 52
Unrealized Gains 13 13
Unrealized Losses Other   (2)
Fair Value 44 63
Other [Member]
   
Held-to-maturity    
Amortized Cost 20 23
Unrealized Gains 2 1
Unrealized Losses Other-than-Temporary (5) (6)
Unrealized Losses Other (1) (1)
Fair Value 16 17
Obligations of state and political subdivisions [Member]
   
Held-to-maturity    
Amortized Cost 21 23
Unrealized Gains 2 1
Unrealized Losses Other   (1)
Fair Value 23 23
Obligations of foreign governments [Member]
   
Held-to-maturity    
Amortized Cost 8 7
Fair Value 8 7
U.S. Treasury and agencies [Member]
   
Held-to-maturity    
Amortized Cost 2,558 2,560
Unrealized Gains 27 35
Fair Value 2,585 2,595
Other Debt Securities [Member]
   
Held-to-maturity    
Amortized Cost 119 121
Unrealized Losses Other (22) (29)
Fair Value 97 92
Non-agency [Member] | Commercial Non-Agency Mortgage Backed Securities [Member]
   
Available-for-sale securities    
Amortized Cost 39 42
Unrealized Gains 1 2
Unrealized Losses Other-than-Temporary (1)  
Unrealized Losses Other (2) (2)
Fair Value 37 42
Non-agency [Member] | Commercial Non-Agency Mortgage Backed Securities [Member]
   
Held-to-maturity    
Amortized Cost 4 4
Unrealized Losses Other (1) (2)
Fair Value 3 2
Agency [Member] | Residential [Member]
   
Available-for-sale securities    
Amortized Cost 27,255 39,337
Unrealized Gains 826 981
Unrealized Losses Other (2) (4)
Fair Value 28,079 40,314
Agency [Member] | Commercial Non-Agency Mortgage Backed Securities [Member]
   
Available-for-sale securities    
Amortized Cost 124 133
Unrealized Gains 8 7
Fair Value 132 140
Agency [Member] | Residential [Member]
   
Held-to-maturity    
Amortized Cost 31,873 16,085
Unrealized Gains 439 333
Unrealized Losses Other (8) (3)
Fair Value 32,304 16,415
Residential Non-agency Prime [Member] | Residential [Member]
   
Available-for-sale securities    
Amortized Cost 785 911
Unrealized Gains 5 5
Unrealized Losses Other-than-Temporary (51) (63)
Unrealized Losses Other (26) (50)
Fair Value 713 803
Residential Non-agency Non-Prime [Member] | Residential [Member]
   
Available-for-sale securities    
Amortized Cost 976 1,047
Unrealized Gains 13 9
Unrealized Losses Other-than-Temporary (188) (247)
Unrealized Losses Other (5) (7)
Fair Value 796 802
Residential Non-agency Non-Prime [Member] | Residential [Member]
   
Held-to-maturity    
Amortized Cost 1 2
Fair Value $ 1 $ 2
[1] (a) Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.