Federal Income Taxes (Reconciliation Of The Effective Tax Rate Differences) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of effective tax rate differences [Abstract]
Tax rate times pre-tax income	$ 510	$ 501	$ 700
Effect of:
Tax-preferred investment income	(196)	(197)	(185)
Tax credits	(28)	(26)	(27)
Change in uncertain tax positions	(14)	(2)	(16)
Excess tax benefits from share-based compensation	(8)
Other items	2		11
Federal income tax expense (benefit)	$ 266	$ 276	$ 483
Effective tax rate	18.00%	19.00%	24.00%
Parent Company [Member]
Effect of:
Federal income tax expense (benefit)	$ (95)	$ (66)	$ (77)

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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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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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