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Investment Securities (Details 2) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 sec | Dec. 31, 2011 sec
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Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 111 | $ 15
Estimated Fair Value, 12 months or more | 354 | 1,096
Estimated Fair Value, Total | 465 | 1,111
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (2) | (2)
Gross Unrealized Losses, 12 months or more | (21) | (73)
Gross Unrealized Losses, Total | (23) | (75)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 15 | 1
Number of securities, 12 months or more | 37 | 136
Number of securities, total | 52 | 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 | 111 | 0
Estimated Fair Value, 12 months or more | 281 | 884
Estimated Fair Value, Total | 392 | 884
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (2) | 0
Gross Unrealized Losses, 12 months or more | (8) | (35)
Gross Unrealized Losses, Total | (10) | (35)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 15 | 0
Number of securities, 12 months or more | 31 | 114
Number of securities, total | 46 | 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 | 73 | 212
Estimated Fair Value, Total | 73 | 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 | (13) | (38)
Gross Unrealized Losses, Total | $ (13) | $ (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 | 6 | 22
Number of securities, total | 6 | 23

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