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Income Taxes (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Currently payable
Federal income taxes	$ 701us-gaap_CurrentFederalTaxExpenseBenefit	$ 803us-gaap_CurrentFederalTaxExpenseBenefit	$ 912us-gaap_CurrentFederalTaxExpenseBenefit
Foreign income taxes	10us-gaap_CurrentForeignTaxExpenseBenefit	28us-gaap_CurrentForeignTaxExpenseBenefit	15us-gaap_CurrentForeignTaxExpenseBenefit
Total federal and foreign income taxes currently payable	711us-gaap_CurrentIncomeTaxExpenseBenefit	831us-gaap_CurrentIncomeTaxExpenseBenefit	927us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred federal and foreign income taxes	157us-gaap_DeferredIncomeTaxExpenseBenefit	80us-gaap_DeferredIncomeTaxExpenseBenefit	60us-gaap_DeferredIncomeTaxExpenseBenefit
Total federal and foreign income taxes	$ 868us-gaap_IncomeTaxExpenseBenefit	$ 911us-gaap_IncomeTaxExpenseBenefit	$ 987us-gaap_IncomeTaxExpenseBenefit

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

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

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