Accumulated Other Comprehensive Income Accumulated Other Comrephensive Income - Parenthetical (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Equity [Abstract]
Tax (benefit) expense included in net unrealized gains (losses)	$ (398)	$ 203	$ (455)	$ 127
Tax included in reclassification	(9)	(27)	(60)	(39)
Other than Temporary impairment losses, Tax (benefit)	(48)	0	(48)	0
Tax (benefit) expense included in net unrealized gains (losses)	35	(29)	49	(5)
Tax included in reclassification	1	2	3	3
Tax included in unfunded pension liability	$ 0	$ 0	$ 0	$ 1