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Federal Income Taxes (Federal Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax expense (benefit), continuing operations [Abstract]
Current	$ 220us-gaap_CurrentFederalTaxExpenseBenefit	$ 169us-gaap_CurrentFederalTaxExpenseBenefit	$ 23us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	263	218	259
Federal income tax expense (benefit)	483us-gaap_IncomeTaxExpenseBenefit	387us-gaap_IncomeTaxExpenseBenefit	282us-gaap_IncomeTaxExpenseBenefit
Parent Company [Member]
Income tax expense (benefit), continuing operations [Abstract]
Federal income tax expense (benefit)	$ (77)	$ (73)	$ (85)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.