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Investment Securities (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 15 $ 2,905
Estimated Fair Value, 12 months or more 1,096 1,079
Estimated Fair Value, Total 1,111 3,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (2) (159)
Gross Unrealized Losses, 12 months or more (73) (212)
Gross Unrealized Losses, Total (75) (371)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months 1 505
Number of securities, 12 months or more 136 146
Number of securities, total 137 651
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months 0 2,554
Estimated Fair Value, 12 months or more 884 79
Estimated Fair Value, Total 884 2,633
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 0 (113)
Gross Unrealized Losses, 12 months or more (35) (7)
Gross Unrealized Losses, Total (35) (120)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months 0 457
Number of securities, 12 months or more 114 31
Number of securities, total 114 488
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months 15 351
Estimated Fair Value, 12 months or more 212 1,000
Estimated Fair Value, Total 227 1,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (2) (46)
Gross Unrealized Losses, 12 months or more (38) (205)
Gross Unrealized Losses, Total $ (40) $ (251)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months 1 48
Number of securities, 12 months or more 22 115
Number of securities, total 23 163