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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | QUARTERLY FINANCIAL DATA (UNAUDITED)
| Quarter ended
(in millions, except per share data) | March 31 | June 30 | September 30 | December 31
2018 |  |  |  |
Total revenues | $ | 861 |  | $ | 850 |  | $ | 875 |  | $ | 917 |
Insurance costs | 641 |  | 630 |  | 647 |  | 692 |
Operating income | 71 |  | 76 |  | 62 |  | 42 |
Net income | 54 |  | 58 |  | 51 |  | 29 |
Basic net income per share | $ | 0.77 |  | $ | 0.82 |  | $ | 0.73 |  | $ | 0.41 |
Diluted net income per share | $ | 0.75 |  | $ | 0.80 |  | $ | 0.71 |  | $ | 0.40 |
2017 |  |  |  |
Total revenues | $ | 808 |  | $ | 801 |  | $ | 818 |  | $ | 848 |
Insurance costs | 609 |  | 600 |  | 613 |  | 644 |
Operating income | 49 |  | 57 |  | 63 |  | 48 |
Net income (1) | 29 |  | 40 |  | 43 |  | 66 |
Basic net income per share (1) | $ | 0.42 |  | $ | 0.58 |  | $ | 0.62 |  | $ | 0.95 |
Diluted net income per share (1) | $ | 0.41 |  | $ | 0.56 |  | $ | 0.60 |  | $ | 0.92 |
(1) Results of the quarter ended December 31, 2017 included a $40 million benefit due to tax rate change as a result of the TCJA enactment on December 22, 2017.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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