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Quarterly Information (unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Information (unaudited) | Quarterly Information (unaudited) The following tables present certain unaudited quarterly financial information for fiscal 2018 and 2017. This supplemental quarterly financial information reflects all normal recurring adjustments, in the opinion of management, necessary to fairly state our results of operations for the periods presented when read in conjunction with the accompanying Consolidated Financial Statements and related Notes.
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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- References No definition available. + Details
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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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