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Investment Securities (Details 2) (USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 239 | $ 15
Estimated Fair Value, 12 months or more | 468 | 1,096
Estimated Fair Value, Total | 707 | 1,111
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (6) | (2)
Gross Unrealized Losses, 12 months or more | (36) | (73)
Gross Unrealized Losses, Total | (42) | (75)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 33 | 1
Number of securities, 12 months or more | 51 | 136
Number of securities, total | 84 | 137
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 | 239 | 0
Estimated Fair Value, 12 months or more | 344 | 884
Estimated Fair Value, Total | 583 | 884
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (6) | 0
Gross Unrealized Losses, 12 months or more | (18) | (35)
Gross Unrealized Losses, Total | (24) | (35)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 33 | 0
Number of securities, 12 months or more | 41 | 114
Number of securities, total | 74 | 114
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 | 0 | 15
Estimated Fair Value, 12 months or more | 124 | 212
Estimated Fair Value, Total | 124 | 227
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | 0 | (2)
Gross Unrealized Losses, 12 months or more | (18) | (38)
Gross Unrealized Losses, Total | $ (18) | $ (40)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 0 | 1
Number of securities, 12 months or more | 10 | 22
Number of securities, total | 10 | 23

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