Reinsurance (Effects of Reinsurance on Earnings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Premiums:
Direct premiums	$ 1,398	$ 1,466	$ 1,597
Reinsurance assumed	(10)	12	15
Reinsurance ceded	(701)	(742)	(765)
Net premiums	687	736	847
Universal life and investment-type product policy fees [Abstract]
Direct universal life and investment-type product policy fees	3,533	3,376	3,432
Reinsurance assumed	50	55	79
Reinsurance ceded	(597)	(592)	(529)
Net universal life and investment-type product policy fees	2,986	2,839	2,982
Component of Operating Income [Abstract]
Direct other revenues	262	239	244
Reinsurance assumed	6	18	3
Reinsurance ceded	66	45	19
Net other revenues	334	302	266
Policyholder benefits and claims:
Direct policyholder benefits and claims	4,677	7,445	5,267
Reinsurance assumed	125	158	70
Reinsurance ceded	(1,589)	(1,914)	(1,799)
Net policyholder benefits and claims	3,213	5,689	3,538
Other Expenses [Abstract]
Direct other expenses	1,815	1,851	1,839
Assumed Other Expenses	(5)	2	(10)
Ceded Other Expenses	(10)	(9)	(20)
Total other expenses	$ 1,800	$ 1,844	$ 1,809