Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	$ (1,047)	$ 1,180	$ 1,001
Less: reclassification adjustment of realized capital gains and losses	42	(84)	579
Unrealized net capital gains and losses	(1,089)	1,264	422
Unrealized foreign currency translation adjustments	3		(2)
Other comprehensive (loss) income	(1,086)	1,264	420
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	367	(414)	(350)
Less: reclassification adjustment of realized capital gains and losses	(15)	29	(203)
Unrealized net capital gains and losses	382	(443)	(147)
Unrealized foreign currency translation adjustments	(1)		1
Other comprehensive (loss) income	381	(443)	(146)
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(680)	766	651
Less: reclassification adjustment of realized capital gains and losses	27	(55)	376
Unrealized net capital gains and losses	(707)	821	275
Unrealized foreign currency translation adjustments	2		(1)
Other comprehensive (loss) income, after-tax	$ (705)	$ 821	$ 274