Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Changes in:
Net unrealized gains (losses) on investments with other-than-temporary impairments	$ 14	$ 40
Net unrealized gains (losses) on other investments	(62)	217
Net unrealized gains (losses) on investments	(48)	257
Foreign currency translation adjustment	(61)	21
Pension and postretirement benefits	5	6
Other comprehensive income (loss), net of tax	(104)	284
Net income (loss)	250	250
Total comprehensive income (loss)	$ 146	$ 534