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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,949 | $ 5,031 | $ 4,999 | $ 4,904 | $ 4,534 | $ 4,546 | $ 4,359 | $ 4,343 | $ 19,883 | $ 17,782 | $ 14,178
Gross margin | 446 | 564 | 254 | 546 | 354 | 471 | 466 | 434 | 1,810 | 1,725 | 1,527
Impairment losses | 269 | 129 | 72 | 0 |  |  |  |  | 470 | 0 | 0
Restructuring and separation costs | 73 | 118 | 43 | 0 |  |  |  |  | 234 | 0 | 0
Net (loss) income | $ (262) | $ (97) | $ (230) | $ 77 | $ (47) | $ 42 | $ 33 | $ 24 | $ (512) | $ 52 | $ 143
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (4.59) | $ (1.70) | $ (4.10) | $ 1.38 | $ (0.85) | $ 0.77 | $ 0.58 | $ 0.44 | $ (9.07) | $ 0.93 | $ 2.75
Diluted (in dollars per share) | $ (4.59) | $ (1.70) | $ (4.10) | $ 1.37 | $ (0.85) | $ 0.76 | $ 0.58 | $ 0.43 | $ (9.07) | $ 0.92 | $ 2.58
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Increase to gross profit |  |  |  |  | $ 13 | $ 14 | $ 12 | $ 14 |  |  |

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