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Reinsurance (Reinsurance on premiums - long-duration contracts) (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Premiums Earned, Net [Abstract]
Net premiums	$ 1,385us-gaap_PremiumsEarnedNet	$ 1,282us-gaap_PremiumsEarnedNet	$ 1,223us-gaap_PremiumsEarnedNet
Long duration contracts [Member]
Premiums Earned, Net [Abstract]
Direct premiums	645	650	661
Reinsurance ceded	(222)	(220)	(219)
Net premiums	$ 423	$ 430	$ 442

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.