Reinsurance (Earned Life Insurance Premiums On Ceded Business) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Direct earned premiums	$ 4,667	$ 4,468	$ 4,151
Ceded earned premiums	(216)	(237)	(260)
Life Insurance Segment
Direct earned premiums	271	259	248
Ceded earned premiums	(62)	(61)	(59)
Net earned premiums	$ 209	$ 198	$ 189