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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of quarterly results of operations
Premium revenue	$ 4,177	$ 4,191	$ 4,029	$ 3,995	$ 3,589	$ 3,377	$ 3,304	$ 2,971	$ 16,392	$ 13,241	$ 9,023
Service revenue	131	133	135	140	107	47	47	52	539	253	210
Operating income	(6)	118	105	89	76	113	116	82	306	387	193
Net income	$ (47)	$ 42	$ 33	$ 24	$ 30	$ 46	$ 39	$ 28	$ 52	$ 143	$ 62
Net income per share:
Basic (USD per share)	$ (0.85)	$ 0.77	$ 0.58	$ 0.44	$ 0.54	$ 0.84	$ 0.78	$ 0.58	$ 0.93	$ 2.75	$ 1.33
Diluted (USD per share)	$ (0.85)	$ 0.76	$ 0.58	$ 0.43	$ 0.52	$ 0.77	$ 0.72	$ 0.56	$ 0.92	$ 2.58	$ 1.29

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