Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 342	$ 291
Other Comprehensive Income (Loss), Net of Tax
Net unrealized gains on investments	(530)	438
Foreign currency translation adjustment	17	12
Pension and postretirement benefits	7	10
Other comprehensive income (loss), net of tax	554	(416)
Total comprehensive income (loss)	896	(125)
Net unrealized gains on investments with other-than-temporary impairments
Other Comprehensive Income (Loss), Net of Tax
Net unrealized gains on investments	4	(9)
Net unrealized gains on other investments
Other Comprehensive Income (Loss), Net of Tax
Net unrealized gains on investments	$ (526)	$ 429