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Federal Income Taxes (Reconciliation Of The Effective Tax Rate Differences) (Details) - USD ($) $ in Millions | 12 Months Ended
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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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- Definition 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 the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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