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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Abstract] |  |  |
U.S. Statutory Tax Rate | 21.00% | 21.00% | 21.00%
Valuation allowance on deferred tax assets | $ 0 | $ 0 |
Undistributed accumulated earnings of foreign subsidiaries | 3,200,000,000 | $ 2,700,000,000 |
Earnings, Indefinitely Reinvested Abroad Due To Regulatory And Other Capital Requirements | 3,000,000,000.0 |  |
Estimated Deferred Tax Liablity Due To Hypothetical Repatriation Of Earnings | 42,000,000 |  |
Liability for Uncertainty in Income Taxes | $ 3,000,000 |  |

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