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Quarterly Results of Operations (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations (Unaudited) | Quarterly Results of Operations (Unaudited) The following table summarizes quarterly unaudited results of operations for the years ended December 31, 2018 and 2017.
| For The Quarter Ended
| March 31, 2018 |  | June 30, 2018 |  | Sept. 30, 2018 |  | December 31, 2018
| (In millions, except per-share data)
Total revenue | $ | 4,646 |  |  | $ | 4,883 |  |  | $ | 4,697 |  |  | $ | 4,664 |
Margin | 615 |  |  | 673 |  |  | 566 |  |  | 664 |
Gain (loss) on sales of subsidiaries | — |  |  | — |  |  | 37 |  |  | (52 | )
Restructuring and separation costs | 25 |  |  | 8 |  |  | 5 |  |  | 8 |
Net income | 107 |  |  | 202 |  |  | 197 |  |  | 201 |
Net income per share (1): |  |  |  |  |  |  |
Basic | $ | 1.79 |  |  | $ | 3.29 |  |  | $ | 3.22 |  |  | $ | 3.24 |
Diluted | $ | 1.64 |  |  | $ | 3.02 |  |  | $ | 2.90 |  |  | $ | 3.01 |
| 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 |
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 | )
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(1) | The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method and is based on the weighted-average common share equivalents outstanding during each quarter. Accordingly, the sum of the quarterly net income (loss) per share may not agree to the total for the year. 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.

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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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