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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 and 2016.
| For The Quarter Ended
| March 31, 2017 |  | June 30, 2017 |  | Sept. 30, 2017 |  | December 31, 2017
| (In millions, except per-share data)
Total revenue | $ | 4,904 |  |  | $ | 4,999 |  |  | $ | 5,031 |  |  | $ | 4,949 |
Gross margin | 546 |  |  | 254 |  |  | 564 |  |  | 446 |
Impairment losses | — |  |  | 72 |  |  | 129 |  |  | 269 |
Restructuring and separation costs | — |  |  | 43 |  |  | 118 |  |  | 73 |
Net income (loss) | 77 |  |  | (230 | ) |  | (97 | ) |  | (262 | )
Net income (loss) per share (1): |  |  |  |  |  |  |
Basic | $ | 1.38 |  |  | $ | (4.10 | ) |  | $ | (1.70 | ) |  | $ | (4.59 | )
Diluted | $ | 1.37 |  |  | $ | (4.10 | ) |  | $ | (1.70 | ) |  | $ | (4.59 | )
| For The Quarter Ended
| March 31, 2016 |  | June 30, 2016 |  | Sept. 30, 2016 |  | December 31, 2016
| (In millions, except per-share data)
Total revenue | $ | 4,343 |  |  | $ | 4,359 |  |  | $ | 4,546 |  |  | $ | 4,534 |
Gross margin (2) | 434 |  |  | 466 |  |  | 471 |  |  | 354 |
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 | )
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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 (loss) per share because to do so would be anti-dilutive.
(2) | The Centers for Medicare and Medicaid Services (CMS) incorporates the Health Insurer Fee (HIF) in our Medicare and Marketplace premium rates. We have therefore reclassified such amounts in our consolidated statements of operations to premium revenue, from health insurer fees reimbursed, for all applicable periods presented. As a result, gross margin amounts differ from amounts previously reported as follows: for the quarters ended March 31, June 30, September 30, and December 31, 2016, gross margin increased $14 million, $12 million, $14 million, and $13 million, respectively.

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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=84173487&loc=d3e1280-108306 + Details
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