Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (Deferred Sales Inducements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
DSI:
Balance at January 1,	$ 158	$ 210	$ 220
Capitalization	6	7	7
Amortization	(37)	(39)	(33)
Unrealized investment gains (losses)	(18)	(20)	16
Effect of foreign currency translation	(1)	0	0
Balance at December 31,	$ 108	$ 158	$ 210