Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 1,153	$ 931	$ 2,952	$ 3,074
Changes in:
Unrealized net capital gains and losses	142	369	857	2,025
Unrealized foreign currency translation adjustments	25	(10)	(5)	(1)
Unamortized pension and other postretirement prior service credit	38	(12)	31	(35)
Other comprehensive income, after-tax	205	347	883	1,989
Comprehensive income	$ 1,358	$ 1,278	$ 3,835	$ 5,063