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, 2019	Dec. 31, 2018	Dec. 31, 2017
DSI:
Balance at January 1,	$ 210	$ 220	$ 241
Capitalization	7	7	16
Amortization	(39)	(33)	(29)
Unrealized investment gains (losses)	(20)	16	(6)
Effect of foreign currency translation	0	0	(2)
Balance at December 31,	$ 158	$ 210	$ 220