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Investment Securities (Details 2) (USD $) In Millions, except Share data | Sep. 30, 2011 | Dec. 31, 2010
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Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 465 | $ 2,905
Estimated Fair Value, 12 months or more | 1,114 | 1,079
Estimated Fair Value, Total | 1,579 | 3,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (12) | (159)
Gross Unrealized Losses, 12 months or more | (93) | (212)
Gross Unrealized Losses, Total | (105) | (371)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 81 | 505
Number of securities, 12 months or more | 137 | 146
Number of securities, total | 218 | 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 | 430 | 2,554
Estimated Fair Value, 12 months or more | 812 | 79
Estimated Fair Value, Total | 1,242 | 2,633
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (8) | (113)
Gross Unrealized Losses, 12 months or more | (39) | (7)
Gross Unrealized Losses, Total | (47) | (120)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 79 | 457
Number of securities, 12 months or more | 105 | 31
Number of securities, total | 184 | 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 | 35 | 351
Estimated Fair Value, 12 months or more | 302 | 1,000
Estimated Fair Value, Total | 337 | 1,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (4) | (46)
Gross Unrealized Losses, 12 months or more | (54) | (205)
Gross Unrealized Losses, Total | $ (58) | $ (251)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 2 | 48
Number of securities, 12 months or more | 32 | 115
Number of securities, total | 34 | 163

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