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Federal Income Taxes (Reconciliation Of The Effective Tax Rate Differences) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of effective tax rate differences [Abstract] |  |  |
Income (loss) before taxes | $ 1,638 | $ 423 | $ 919
Federal statutory rate | 21.00% | 21.00% | 21.00%
Federal income tax expense (benefit) at federal statutory rate | $ 344 | $ 89 | $ 193
Effect of: |  |  |
Tax-preferred investment income | (88) | (98) | (99)
Tax credits | (26) | (39) | (40)
Excess tax benefits from share-based compensation |  | 3 | (9)
Tax impact associated with the Tax Cuts and Jobs Act |  | (37) | (17)
Other items | 3 | 6 | 5
Federal income tax expense (benefit) | $ 233 | $ (76) | $ 33
Effective tax rate | 14.00% | (18.00%) | 4.00%

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