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Investment Securities - Contractual Maturities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Total Estimated Fair Value |  |  |
Due within 1 year | $ 953 |  |
Due after 1 year but within 5 years | 166 |  |
Due after 5 years but within 10 years | 33 |  |
Due after 10 years | 40 |  |
Total | 1,192 | $ 2,120 |
Total Cost |  |  |
Due within 1 year | 955 |  |
Due after 1 year but within 5 years | 166 |  |
Due after 5 years but within 10 years | 32 |  |
Due after 10 years | 50 |  |
Total | $ 1,203 |  |
Weighted average yields |  |  |
Weighted average yields, due within 1 year | 5.33% |  |
Weighted average yields, due after 1 years but within 5 years | 3.71% |  |
Weighted average yields, due after 5 years but within 10 years | 4.81% |  |
Weighted average yield, due after 10 years | 2.73% |  |
Total | 4.98% |  |
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 | 0 |  |
Due after 5 years but within 10 years | 23 |  |
Due after 10 years | 26 |  |
Total | 49 | $ 55 |
Total Cost |  |  |
Total | 57 | 61 |
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 | 4 |
Total Cost |  |  |
Total | 4 | 4 |
U.S. Government treasury obligations |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 189 |  |
Due after 1 year but within 5 years | 98 |  |
Due after 5 years but within 10 years | 0 |  |
Due after 10 years | 0 |  |
Total | 287 | 1,206 |
Total Cost |  |  |
Total | 289 | 1,217 |
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 | 10 |  |
Total | 10 | 11 |
Total Cost |  |  |
Total | 11 | 12 |
Foreign government bonds and obligations |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 764 |  |
Due after 1 year but within 5 years | 1 |  |
Due after 5 years but within 10 years | 0 |  |
Due after 10 years | 0 |  |
Total | 765 | 770 |
Total Cost |  |  |
Total | 765 | 770 |
Other |  |  |
Total Estimated Fair Value |  |  |
Due within 1 year | 0 |  |
Due after 1 year but within 5 years | 67 |  |
Due after 5 years but within 10 years | 10 |  |
Due after 10 years | 0 |  |
Total | 77 | 74 |
Total Cost |  |  |
Total | $ 77 | $ 74 |

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