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Other Assets (Proportional Amortization Investment) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Other Assets [Abstract] |  |  |
Tax credits and other tax benefits from proportional amortization investments | $ 39,000,000 | $ 47,000,000 |
Investment amortization expense recognized as a component of income tax expense | 32,000,000 | 38,000,000 |
Net Benefit from Proportional Amortization Investments | 7,000,000 | 9,000,000 |
Investment program, proportional amortization method, elected, impairment loss | 0 | $ 0 |
Proportional amortization investments | 1,877,000,000 |  | $ 1,866,000,000
Unfunded commitments for proportional amortization investments | $ 917,000,000 |  | $ 973,000,000
Unfunded commitments, period to be paid | 5 years |  |

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