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Federal Income Taxes (Reconciliation Of The Effective Tax Rate Differences) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of effective tax rate differences [Abstract]
Income (loss) before taxes	$ (16)	$ (3,148)	$ 257	$ 77	$ 854	$ 366	$ 776	$ 254	$ (2,830)	$ 2,249	$ 423
Federal statutory rate									21.00%	21.00%	21.00%
Federal income tax expense (benefit) at federal statutory rate									$ (594)	$ 472	$ 89
Effect of:
Tax-preferred investment income									(90)	(88)	(98)
Tax credits									(42)	(26)	(39)
Excess tax benefits from share-based compensation									(1)		3
Goodwill impairment									133
Tax impact associated with the Tax Cuts and Jobs Act											(37)
Other items									5	4	6
Federal income tax expense (benefit)	$ (37)	$ (565)	$ 29	$ (15)	$ 146	$ 50	$ 131	$ 35	$ (589)	$ 362	$ (76)
Effective tax rate									21.00%	16.00%	(18.00%)

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