Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 468	$ 372	$ 741	$ 1,002
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Changes in net unrealized gain on fixed maturities	1,428	664	371	1,343
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	(5)	11	39	16
Changes in foreign currency translation adjustments	1	3	(7)	4
Changes in pension and other postretirement plan adjustments	(12)	(9)	(23)	(17)
OCI, net of tax	1,436	687	427	1,381
Comprehensive income	$ 1,904	$ 1,059	$ 1,168	$ 2,383