Other Comprehensive Income (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
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	$ (16)	$ (807)	$ 474	$ (792)
Less: reclassification adjustment of realized capital gains and losses	(10)	57	(21)	33
Unrealized net capital gains and losses	(6)	(864)	495	(825)
Unrealized foreign currency translation adjustments		(2)	2
Other comprehensive income (loss)	(6)	(866)	497	(825)
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	6	282	(167)	277
Less: reclassification adjustment of realized capital gains and losses	4	(20)	7	(12)
Unrealized net capital gains and losses	2	302	(174)	289
Unrealized foreign currency translation adjustments		1	(1)
Other comprehensive income (loss)	2	303	(175)	289
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(10)	(525)	307	(515)
Less: reclassification adjustment of realized capital gains and losses	(6)	37	(14)	21
Unrealized net capital gains and losses	(4)	(562)	321	(536)
Unrealized foreign currency translation adjustments		(1)	1
Other comprehensive (loss) income, after-tax	(4)	(563)	322	(536)
Net income	132	150	259	259
Comprehensive income (loss)	$ 128	$ (413)	$ 581	$ (277)