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Federal Income Taxes (Reconciliation Of The Effective Tax Rate Differences) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of effective tax rate differences [Abstract]
Income (loss) before taxes	$ 423	$ 919	$ 1,885
Federal statutory rate	21.00%	21.00%	21.00%
Federal income tax expense (benefit) at federal statutory rate	$ 89	$ 193	$ 396
Effect of:
Tax-preferred investment income	(98)	(99)	(87)
Tax credits	(39)	(40)	(39)
Excess tax benefits from share-based compensation	3	(9)	(5)
Tax impact associated with the Tax Cuts and Jobs Act	(37)	(17)	(19)
Other items	6	5	(2)
Federal income tax expense (benefit)	$ (76)	$ 33	$ 244
Effective tax rate	(18.00%)	4.00%	13.00%
Variable Annuity [Member]
Effect of:
Tax impact associated with the Tax Cuts and Jobs Act			$ (27)

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