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Investment Securities (Details 2) $ in Millions | Dec. 31, 2020 security | Dec. 31, 2019 USD ($) security
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Available-for-sale investment securities with gross unrealized losses |  |
Number of Securities, Less than 12 months | security |  | 2
Number of Securities, 12 months or more | security |  | 3
Number of Securities, Total | security | 0 | 5
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months |  | $ 18
Estimated Fair Value, 12 months or more |  | 324
Estimated Fair Value, Total |  | 342
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months |  | (1)
Gross Unrealized Losses, 12 months or more |  | (1)
Gross Unrealized Losses, Total |  | $ (2)
Ratio of fair value to amortized cost between 90%-100% [Member] |  |
Available-for-sale investment securities with gross unrealized losses |  |
Number of Securities, Less than 12 months | security |  | 2
Number of Securities, 12 months or more | security |  | 3
Number of Securities, Total | security |  | 5
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months |  | $ 18
Estimated Fair Value, 12 months or more |  | 324
Estimated Fair Value, Total |  | 342
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months |  | (1)
Gross Unrealized Losses, 12 months or more |  | (1)
Gross Unrealized Losses, Total |  | $ (2)

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