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Investment Securities (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Estimated Fair Value |  |  |
Estimated Fair Value, Due within 1 year | $ 1,477 |  |
Estimated Fair Value, Due after 1 year but within 5 years | 900 |  |
Estimated Fair Value, Due after 5 years but within 10 years | 41 |  |
Estimated Fair Value, Due after 10 years | 94 |  |
Total | 2,512 |  |
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |  |
Due within 1 year | 1,476 |  |
Due after 1 year but within 5 years | 879 |  |
Due after 5 years but within 10 years | 35 |  |
Due after 10 years | 92 |  |
Available-for-sale debt securities, Cost | $ 2,482 |  |
Weighted average yields |  |  |
Weighted average yields, due within 1 year | 1.74% |  |
Weighted average yields, due after 1 years but within 5 years | 2.42% |  |
Weighted average yields, due after 5 years but within 10 years | 5.46% |  |
Weighted average yield, due after 10 years | 3.10% |  |
Weighted average yields, Total | 2.08% |  |
Combined tax at U.S. statutory federal income tax rate (as a percent) | 21.00% | 21.00% | 21.00%
State and municipal obligations |  |  |
Estimated Fair Value |  |  |
Estimated Fair Value, Due within 1 year | $ 6 |  |
Estimated Fair Value, Due after 1 year but within 5 years | 5 |  |
Estimated Fair Value, Due after 5 years but within 10 years | 30 |  |
Estimated Fair Value, Due after 10 years | 70 |  |
Total | 111 |  |
U.S. Government agency obligations |  |  |
Estimated Fair Value |  |  |
Estimated Fair Value, Due within 1 year | 0 |  |
Estimated Fair Value, Due after 1 year but within 5 years | 0 |  |
Estimated Fair Value, Due after 5 years but within 10 years | 0 |  |
Estimated Fair Value, Due after 10 years | 6 |  |
Total | 6 |  |
U.S. Government treasury obligations |  |  |
Estimated Fair Value |  |  |
Estimated Fair Value, Due within 1 year | 832 |  |
Estimated Fair Value, Due after 1 year but within 5 years | 862 |  |
Estimated Fair Value, Due after 5 years but within 10 years | 10 |  |
Estimated Fair Value, Due after 10 years | 0 |  |
Total | 1,704 |  |
Mortgage-backed securities |  |  |
Estimated Fair Value |  |  |
Estimated Fair Value, Due within 1 year | 0 |  |
Estimated Fair Value, Due after 1 year but within 5 years | 0 |  |
Estimated Fair Value, Due after 5 years but within 10 years | 0 |  |
Estimated Fair Value, Due after 10 years | 18 |  |
Total | 18 |  |
Foreign government bonds and obligations |  |  |
Estimated Fair Value |  |  |
Estimated Fair Value, Due within 1 year | 628 |  |
Estimated Fair Value, Due after 1 year but within 5 years | 1 |  |
Estimated Fair Value, Due after 5 years but within 10 years | 1 |  |
Estimated Fair Value, Due after 10 years | 0 |  |
Total | 630 |  |
Other |  |  |
Estimated Fair Value |  |  |
Estimated Fair Value, Due within 1 year | 11 |  |
Estimated Fair Value, Due after 1 year but within 5 years | 32 |  |
Estimated Fair Value, Due after 5 years but within 10 years | 0 |  |
Estimated Fair Value, Due after 10 years | 0 |  |
Total | $ 43 |  |

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