Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 5,576	$ 4,847	$ 2,160
Changes in:
Unrealized net capital gains and losses	1,293	1,889	(754)
Unrealized foreign currency translation adjustments	52	(10)	(48)
Unamortized pension and other postretirement prior service credit	9	(47)	(59)
Other comprehensive income (loss), after-tax	1,354	1,832	(861)
Comprehensive income	$ 6,930	$ 6,679	$ 1,299