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Investment Securities (Details 2) (USD $) In Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2011 | Dec. 31, 2010
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 1,647 | $ 2,905
Estimated Fair Value, 12 months or more | 1,094 | 1,079
Estimated Fair Value, Total | 2,741 | 3,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (73) | (159)
Gross Unrealized Losses, 12 months or more | (174) | (212)
Gross Unrealized Losses, Total | (247) | (371)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 291 | 505
Number of securities, 12 months or more | 137 | 146
Number of securities, total | 428 | 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 | 1,576 | 2,554
Estimated Fair Value, 12 months or more | 353 | 79
Estimated Fair Value, Total | 1,929 | 2,633
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (61) | (113)
Gross Unrealized Losses, 12 months or more | (30) | (7)
Gross Unrealized Losses, Total | (91) | (120)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 280 | 457
Number of securities, 12 months or more | 64 | 31
Number of securities, total | 344 | 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 | 71 | 351
Estimated Fair Value, 12 months or more | 741 | 1,000
Estimated Fair Value, Total | 812 | 1,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (12) | (46)
Gross Unrealized Losses, 12 months or more | (144) | (205)
Gross Unrealized Losses, Total | $ (156) | $ (251)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 11 | 48
Number of securities, 12 months or more | 73 | 115
Number of securities, total | 84 | 163

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