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Federal Income Taxes (Reconciliation Of The Effective Tax Rate Differences) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of effective tax rate differences [Abstract]
Tax rate times pre-tax income	$ 396	$ 510	$ 501
Effect of:
Tax-preferred investment income	(280)	(196)	(197)
Tax credits	(29)	(28)	(26)
Change in uncertain tax positions	(17)	(14)	(2)
Excess tax benefits from share-based compensation	(12)	(8)
Goodwill impairment	316
Deferred tax impact from the Tax Cut and Jobs Act	(1,322)
Other items	(1)	2
Federal income tax expense (benefit)	$ (949)	$ 266	$ 276
Effective tax rate	(84.00%)	18.00%	19.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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