Accumulated Other Comprehensive Income - Parenthetical (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ 2	$ (6)	$ 2	$ (6)	$ 2	$ 2	$ (6)	$ (6)
Tax (benefit) expense included in net unrealized gains (losses)	110	(398)	202	(455)
Tax included in reclassification	3	(9)	(6)	(60)
Other than Temporary impairment losses, Tax (benefit)	0	(48)	0	(48)
Tax included in reclassification	1	0	3	0
Tax (benefit) expense included in net unrealized gains (losses)	(10)	35	(23)	49
Tax included in reclassification	$ 1	$ 1	$ 1	$ 3