Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (VODA and VOCRA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance [Abstract]
Balance at January 1,	$ 719	$ 847	$ 975
Amortization	(73)	(75)	(82)
Effect of foreign currency translation	(17)	(53)	(46)
Balance at December 31,	629	719	847
Accumulated amortization	$ 648	$ 575	$ 500