Accumulated Other Comprehensive Income Accumulated Other Comrephensive Income - Parenthetical (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity [Abstract]
Tax (benefit) expense included in net unrealized gains (losses)	$ (13)	$ 89	$ (468)	$ 217
Tax included in reclassification	(14)	(20)	(75)	(60)
Other than Temporary impairment losses, Tax (benefit)	0	0	(48)	0
Tax included in reclassification	1	0	1	0
Tax (benefit) expense included in net unrealized gains (losses)	14	5	63	1
Tax included in reclassification	1	2	4	5
Tax included in unfunded pension liability	$ 1	$ 0	$ 1	$ 1