Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ 142	$ 761	$ 36	$ 857
Investments with no other-than-temporary impairment, net of tax provision (benefit) of $34, $52, $61 and $94	95	129	169	210
Investments with other-than-temporary impairment, net of tax provision (benefit) of $4, $(7), $(4) and $(3)	5	(14)	(13)	(6)
Unrealized holding gains (losses) arising during the period, net of tax	100	115	156	204
Less: reclassification adjustment for gains (losses) included in net income (loss), net of tax provision (benefit) of $(1), $(4), $(6), and $(5)	0	(9)	(5)	(12)
Change in net unrealized gains on investments	100	124	161	216
Other, net of tax provision (benefit) of $2, $(1), $2 and $0	1	(3)	2	(1)
Other comprehensive income (loss)	101	121	163	215
Comprehensive income (loss)	$ 243	$ 882	$ 199	$ 1,072