Accumulated Other Comprehensive Income - Parenthetical (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stockholders' Equity Note [Abstract]
Tax (benefit) expense included in net unrealized gains (losses)	$ 93	$ (61)
Tax included in reclassification	(9)	(47)
Other than Temporary impairment losses, Tax (benefit)	0	0
Tax included in reclassification	1	0
Tax (benefit) expense included in net unrealized gains (losses)	(14)	13
Tax included in reclassification	1	2
Tax included in unfunded pension liability	0	0
Tax Effect of Net Unrealized Gains in Other Than Temporary Impairment Losses, Portion in Other Comprehensive Income (Loss) Net of Tax, Portion Attrible to Parent, Available-for-sale Securites	0	0
Tax Effect Of Reclassification Adjustment Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Available For Sale Securities	0	0
Tax Effect Of Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost And Transition Obligation Recognized In Net Periodic Pension Cost	$ 0	$ 0