Reinsurance (Reinsurance on premiums - long-duration contracts) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effects of Reinsurance [Line Items]
Total net earned premiums	$ 1,455	$ 1,385	$ 1,282
Traditional Long-Duration Products [Member]
Effects of Reinsurance [Line Items]
Direct premiums earned	629	645	650
Ceded premiums earned	(223)	(222)	(220)
Total net earned premiums	$ 406	$ 423	$ 430