Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	$ 58	$ (76)	$ 525	$ (860)
Less: reclassification adjustment of realized capital gains and losses	21	(6)	(7)	35
Unrealized net capital gains and losses	37	(70)	532	(895)
Unrealized foreign currency translation adjustments	0	0	2	0
Other comprehensive income (loss)	37	(70)	534	(895)
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(20)	27	(185)	302
Less: reclassification adjustment of realized capital gains and losses	(7)	2	2	(12)
Unrealized net capital gains and losses	(13)	25	(187)	314
Unrealized foreign currency translation adjustments	0	0	(1)	0
Other comprehensive income (loss)	(13)	25	(188)	314
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	38	(49)	340	(558)
Less: reclassification adjustment of realized capital gains and losses	14	(4)	(5)	23
Unrealized net capital gains and losses	24	(45)	345	(581)
Unrealized foreign currency translation adjustments	0	0	1	0
Other comprehensive income (loss), after-tax	24	(45)	346	(581)
Net income	84	(394)	343	(135)
Comprehensive income (loss)	$ 108	$ (439)	$ 689	$ (716)