Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 209	$ 138	$ 275	$ 371
Other Comprehensive Income (Loss), Net of Tax, Changes In:
Net unrealized gains (losses) on investments with other-than-temporary impairments	(1)	(4)	4	(5)
Net unrealized gains (losses) on other investments	310	(365)	544	(253)
Net unrealized gains (losses) on investments	309	(369)	548	(258)
Foreign currency translation adjustment	(48)	49	(34)	(47)
Pension and postretirement benefits	5	42	11	48
Other comprehensive income (loss), net of tax	266	(278)	525	(257)
Total comprehensive income (loss)	$ 475	$ (140)	$ 800	$ 114