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, 2016	Dec. 31, 2015	Dec. 31, 2014
DSI:
Balance at January 1,	$ 774	$ 810	$ 950
Capitalization	25	31	56
Amortization	(111)	(106)	(130)
Unrealized investment gains (losses)	(2)	39	(64)
Effect of foreign currency translation	0	0	(2)
Balance at December 31,	$ 686	$ 774	$ 810