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, 2018	Dec. 31, 2017	Dec. 31, 2016
DSI:
Balance at January 1,	$ 220	$ 241	$ 242
Capitalization	7	16	22
Amortization	(33)	(29)	(23)
Unrealized investment gains (losses)	16	(6)	0
Effect of foreign currency translation	0	(2)	0
Balance at December 31,	$ 210	$ 220	$ 241