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	$ 459	$ 535	$ 1,200	$ 1,537
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Changes in net unrealized gain on fixed maturities	376	401	747	1,744
Change in unrealized losses on fixed maturities for which an allowance for credit losses has been recorded	0		1
Changes in other-than-temporary impairment losses recognized in other comprehensive income		0		1
Changes in net gain on cash flow hedging instruments	(17)	6	22	22
Changes in foreign currency translation adjustments	6	(4)	(1)	0
Changes in pension and other postretirement plan adjustments	(12)	(9)	(35)	(26)
OCI, net of tax	377	412	804	1,793
Comprehensive income	$ 836	$ 947	$ 2,004	$ 3,330