Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Investments with no other-than-temporary impairment, tax provision (benefit)	$ (54)	$ 29	$ (53)	$ 70
Investments with other-than-temporary impairment, tax provision (benefit)	(1)	(8)	(3)	(5)
Reclassification adjustment for gains (losses) included in net income (loss), tax provision (benefit)	$ (4)	$ (3)	$ 2	$ (4)