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Investment Securities (Details 2) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 securities | Dec. 31, 2011 securities
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Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 46 | 1
Number of securities, 12 months or more | 4 | 136
Number of securities, total | 50 | 137
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 100 | $ 15
Estimated Fair Value, 12 months or more | 73 | 1,096
Estimated Fair Value, Total | 173 | 1,111
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (1) | (2)
Gross Unrealized Losses, 12 months or more | (4) | (73)
Gross Unrealized Losses, Total | (5) | (75)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 46 | 0
Number of securities, 12 months or more | 4 | 114
Number of securities, total | 50 | 114
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | 100 | 0
Estimated Fair Value, 12 months or more | 73 | 884
Estimated Fair Value, Total | 173 | 884
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (1) | 0
Gross Unrealized Losses, 12 months or more | (4) | (35)
Gross Unrealized Losses, Total | (5) | (35)
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months |  | 1
Number of securities, 12 months or more |  | 22
Number of securities, total |  | 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months |  | 15
Estimated Fair Value, 12 months or more |  | 212
Estimated Fair Value, Total |  | 227
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months |  | (2)
Gross Unrealized Losses, 12 months or more |  | (38)
Gross Unrealized Losses, Total |  | $ (40)

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