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Investment Securities (Details 2) $ in Millions | Jun. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
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Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | security | 0 | 2
Number of securities, 12 months or more | security | 7 | 29
Number of securities, total | security | 7 | 31
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 224
Estimated Fair Value, 12 months or more | 477 | 873
Estimated Fair Value, Total | 477 | 1,097
Available For Sale Securities Continuous Unrealized Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 Months | 0 | (2)
Gross Unrealized Losses, 12 months or more | (3) | (16)
Gross Unrealized Losses, Total | $ (3) | $ (18)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | security | 0 | 2
Number of securities, 12 months or more | security | 7 | 29
Number of securities, total | security | 7 | 31
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 224
Estimated Fair Value, 12 months or more | 477 | 873
Estimated Fair Value, Total | 477 | 1,097
Available For Sale Securities Continuous Unrealized Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 Months | 0 | (2)
Gross Unrealized Losses, 12 months or more | (3) | (16)
Gross Unrealized Losses, Total | $ (3) | $ (18)

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