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Federal Income Taxes (Federal Income Tax Asset Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Federal income tax asset (liability) [Abstract] |  |
Current | $ (35) | $ 4
Deferred | (2,095) | (2,463)
Total federal income tax asset (liability) | $ (2,130) | $ (2,459)

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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes, net of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of the total net federal income tax asset or liability consisting of the sum of net currently payable income taxes and net deferred income taxes. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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