Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 42	$ (144)
Unrealized holding gains (losses) arising during the period on:
Investments with no other-than-temporary impairment, net of tax provision (benefit) of $41 and $(19)	94	(50)
Investments with other-than-temporary impairment, net of tax provision (benefit) of $3 and $(8)	8	(16)
Unrealized holding gains (losses) arising during the period, net of tax	102	(66)
Less: reclassification adjustment for gains (losses) included in net income (loss), net of tax provision (benefit) of $(1) and $(2)	(2)	(3)
Change in net unrealized gains on investments	104	(63)
Other, net of tax provision	0	(5)
Other comprehensive income (loss)	104	(68)
Comprehensive income (loss)	$ 146	$ (212)