Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 851	$ 717	$ 2,143	$ 1,723
Changes in:
Unrealized net capital gains and losses	682	(133)	1,656	(698)
Unrealized foreign currency translation adjustments	4	(6)	9	(8)
Unamortized pension and other postretirement prior service credit	(11)	(16)	(23)	(30)
Other comprehensive income (loss), after-tax	675	(155)	1,642	(736)
Comprehensive income	$ 1,526	$ 562	$ 3,785	$ 987