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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 917	$ 875	$ 850	$ 861	$ 848	$ 818	$ 801	$ 808
Insurance costs	692	647	630	641	644	613	600	609	$ 2,610	$ 2,466	$ 2,414
Operating income	42	62	76	71	48	63	57	49	251	217	124
Net income	$ 29	$ 51	$ 58	$ 54	$ 66	$ 43	$ 40	$ 29	$ 192	$ 178	$ 61
Basic net income per share (in dollars per share)	$ 0.41	$ 0.73	$ 0.82	$ 0.77	$ 0.95	$ 0.62	$ 0.58	$ 0.42	$ 2.72	$ 2.57	$ 0.88
Diluted net income per share (in dollars per share)	$ 0.40	$ 0.71	$ 0.80	$ 0.75	$ 0.92	$ 0.60	$ 0.56	$ 0.41	$ 2.65	$ 2.49	$ 0.85
Benefit due to change in tax rate									$ 0	$ (40)	$ (1)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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