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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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