Federal Income Taxes (Federal Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income tax expense (benefit), continuing operations [Abstract]
Current	$ 169	$ 23	$ 13
Deferred	218	259	261
Federal income tax expense (benefit)	387	282	274
Parent Company [Member]
Income tax expense (benefit), continuing operations [Abstract]
Federal income tax expense (benefit)	$ (73)	$ (85)	$ (68)