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Quarterly Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations |
In millions, except per share amounts | March 31 |  | June 30 |  | September 30 |  | December 31 (1)
2018 |  |  |  |  |  |  |
Total revenues | $ | 506 |  |  | $ | 544 |  |  | $ | 526 |  |  | $ | 588 |
Gross profit | $ | 223 |  |  | $ | 250 |  |  | $ | 264 |  |  | $ | 289 |
Operating (loss) income | $ | (4 | ) |  | $ | 10 |  |  | $ | 14 |  |  | $ | 23 |
Net (loss) income | $ | (7 | ) |  | $ | 4 |  |  | $ | 18 |  |  | $ | 15 |
Net (loss) income per share: |  |  |  |  |  |  |
Basic | $ | (0.06 | ) |  | $ | 0.03 |  |  | $ | 0.15 |  |  | $ | 0.13 |
Diluted | $ | (0.06 | ) |  | $ | 0.03 |  |  | $ | 0.15 |  |  | $ | 0.13 |
2017 |  |  |  |  |  |  |
Total revenues | $ | 491 |  |  | $ | 513 |  |  | $ | 526 |  |  | $ | 626 |
Gross profit | $ | 225 |  |  | $ | 242 |  |  | $ | 250 |  |  | $ | 307 |
Operating (loss) income | $ | — |  |  | $ | (1 | ) |  | $ | 9 |  |  | $ | 60 |
Net (loss) income | $ | (2 | ) |  | $ | (4 | ) |  | $ | 13 |  |  | $ | (74 | )
Net (loss) income per share: |  |  |  |  |  |  |
Basic | $ | (0.02 | ) |  | $ | (0.03 | ) |  | $ | 0.11 |  |  | $ | (0.61 | )
Diluted | $ | (0.02 | ) |  | $ | (0.03 | ) |  | $ | 0.10 |  |  | $ | (0.61 | )
(1) Loss from operations for the three months ended December 31, 2017 includes $126 million tax impact related to 2017 U.S. Tax Reform.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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