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Investment Securities - Contractual Maturities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Total Estimated Fair Value |  |  |
Due within 1 year | $ 1,778 |  |
Due after 1 year but within 5 years | 261 |  |
Due after 5 years but within 10 years | 32 |  |
Due after 10 years | 49 |  |
Total | 2,120 | $ 4,537 |
Total Cost |  |  |
Due within 1 year | 1,784 |  |
Due after 1 year but within 5 years | 265 |  |
Due after 5 years but within 10 years | 33 |  |
Due after 10 years | 56 |  |
Total | $ 2,138 |  |
Weighted average yields |  |  |
Weighted average yields, due within 1 year | 4.68% |  |
Weighted average yields, due after 1 years but within 5 years | 3.17% |  |
Weighted average yields, due after 5 years but within 10 years | 4.76% |  |
Weighted average yield, due after 10 years | 2.80% |  |
Total | 4.44% |  |
U.S. statutory federal income tax rate | 21.00% | 21.00% | 21.00%
State and municipal obligations |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | $ 0 |  |
Due after 1 year but within 5 years | 1 |  |
Due after 5 years but within 10 years | 20 |  |
Due after 10 years | 34 |  |
Total | 55 | $ 54 |
Total Cost |  |  |
Total | 61 | 64 |
U.S. Government agency obligations |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 0 |  |
Due after 1 year but within 5 years | 0 |  |
Due after 5 years but within 10 years | 0 |  |
Due after 10 years | 4 |  |
Total | 4 | 5 |
Total Cost |  |  |
Total | 4 | 5 |
U.S. Government treasury obligations |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 1,010 |  |
Due after 1 year but within 5 years | 194 |  |
Due after 5 years but within 10 years | 2 |  |
Due after 10 years | 0 |  |
Total | 1,206 | 3,786 |
Total Cost |  |  |
Total | 1,217 | 3,859 |
Mortgage-backed securities |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 0 |  |
Due after 1 year but within 5 years | 0 |  |
Due after 5 years but within 10 years | 0 |  |
Due after 10 years | 11 |  |
Total | 11 | 13 |
Total Cost |  |  |
Total | 12 | 13 |
Foreign government bonds and obligations |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 768 |  |
Due after 1 year but within 5 years | 2 |  |
Due after 5 years but within 10 years | 0 |  |
Due after 10 years | 0 |  |
Total | 770 | 632 |
Total Cost |  |  |
Total | 770 | 633 |
Other |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 0 |  |
Due after 1 year but within 5 years | 64 |  |
Due after 5 years but within 10 years | 10 |  |
Due after 10 years | 0 |  |
Total | 74 | 47 |
Total Cost |  |  |
Total | $ 74 | $ 47 |

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