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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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