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Investment Securities (Details 2) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) securities | Dec. 31, 2015 USD ($) securities
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | securities | 37 | 52
Number of securities, 12 months or more | securities | 6 | 17
Number of securities, total | securities | 43 | 69
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 451 | $ 450
Estimated Fair Value, 12 months or more | 32 | 46
Estimated Fair Value, Total | 483 | 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (19) | (5)
Gross Unrealized Losses, 12 months or more | (2) | (4)
Gross Unrealized Losses, Total | $ (21) | $ (9)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | securities | 33 | 52
Number of securities, 12 months or more | securities | 6 | 15
Number of securities, total | securities | 39 | 67
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 411 | $ 450
Estimated Fair Value, 12 months or more | 32 | 37
Estimated Fair Value, Total | 443 | 487
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (13) | (5)
Gross Unrealized Losses, 12 months or more | (2) | (2)
Gross Unrealized Losses, Total | $ (15) | $ (7)
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | securities | 4 | 0
Number of securities, 12 months or more | securities | 0 | 2
Number of securities, total | securities | 4 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 40 | $ 0
Estimated Fair Value, 12 months or more | 0 | 9
Estimated Fair Value, Total | 40 | 9
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 | 0 | (2)
Gross Unrealized Losses, Total | $ (6) | $ (2)

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