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Federal Income Taxes - Reconciliation of the Effective Tax Rate Differences (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income (loss) before taxes | $ 4,022 | $ (1,148) | $ 1,725
Federal statutory rate | 21.00% | 21.00% | 21.00%
Federal income tax expense (benefit) at federal statutory rate | $ 845 | $ (241) | $ 362
Effect of: |  |  |
Tax-preferred investment income | (32) | (126) | (90)
Tax credits | (39) | (40) | (42)
Excess tax expense (benefit) from stock-based compensation | 3 | 4 | (1)
Goodwill impairment | 0 | 0 | 133
Release of uncertain tax positions | (41) | 0 | 0
Other items | 11 | 7 | 5
Federal income tax expense (benefit) | $ 747 | $ (396) | $ 367
Effective tax rate | 19.00% | 34.00% | 21.00%

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