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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Summary of quarterly results of operations | The following table summarizes quarterly unaudited results of operations for the years ended December 31, 2016 and 2015.
| For The Quarter Ended
| March 31, 2016 |  | June 30, 2016 |  | Sept. 30, 2016 |  | December 31, 2016
| (In millions, except per-share data)
Premium revenue | $ | 3,995 |  |  | $ | 4,029 |  |  | $ | 4,191 |  |  | $ | 4,177 |
Service revenue | 140 |  |  | 135 |  |  | 133 |  |  | 131 |
Operating income (loss) | 89 |  |  | 105 |  |  | 118 |  |  | (6 | )
Net income (loss) | 24 |  |  | 33 |  |  | 42 |  |  | (47 | )
Net income (loss) per share (1): |  |  |  |  |  |  |
Basic | $ | 0.44 |  |  | $ | 0.58 |  |  | $ | 0.77 |  |  | $ | (0.85 | )
Diluted | $ | 0.43 |  |  | $ | 0.58 |  |  | $ | 0.76 |  |  | $ | (0.85 | )
| For The Quarter Ended
| March 31, 2015 |  | June 30, 2015 |  | Sept. 30, 2015 |  | December 31, 2015
| (In millions, except per-share data)
Premium revenue | $ | 2,971 |  |  | $ | 3,304 |  |  | $ | 3,377 |  |  | $ | 3,589 |
Service revenue | 52 |  |  | 47 |  |  | 47 |  |  | 107 |
Operating income | 82 |  |  | 116 |  |  | 113 |  |  | 76 |
Net income | 28 |  |  | 39 |  |  | 46 |  |  | 30 |
Net income per share (1): |  |  |  |  |  |  |
Basic | $ | 0.58 |  |  | $ | 0.78 |  |  | $ | 0.84 |  |  | $ | 0.54 |
Diluted | $ | 0.56 |  |  | $ | 0.72 |  |  | $ | 0.77 |  |  | $ | 0.52 |
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(1) | The dilutive effect of all potentially dilutive common shares is calculated using the treasury-stock method. Certain potentially dilutive common shares issuable are not included in the computation of diluted net income per share because to do so would be anti-dilutive.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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