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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenues |  |  |
Revenues | $ 3,088 | $ 3,018 | $ 2,973
Costs and expenses |  |  |
Operating and maintenance | 2,140 | 1,799 | 1,389
Depreciation and amortization | 855 | 818 | 832
General and administrative | 193 | 188 | 156
Total costs and expenses | 3,188 | 2,805 | 2,377
Loss on impairment | (609) | (1,464) | (1,498)
Loss on disposal of assets, net | (12) |  | (1,603)
Operating loss | (721) | (1,251) | (2,505)
Other income (expense), net |  |  |
Interest income | 43 | 53 | 43
Interest expense, net of amounts capitalized | (660) | (620) | (491)
Loss on retirement of debt | (41) | (3) | (55)
Other, net | 181 | 46 | 5
Total other income (expense), net | (477) | (524) | (498)
Loss before income tax expense | (1,198) | (1,775) | (3,003)
Income tax expense | 59 | 228 | 94
Net loss | (1,257) | (2,003) | (3,097)
Net income (loss) attributable to noncontrolling interest | (2) | (7) | 30
Net loss attributable to controlling interest | $ (1,255) | $ (1,996) | $ (3,127)
Loss per share |  |  |
Basic (in dollars per share) | $ (2.05) | $ (4.27) | $ (8.00)
Diluted (in dollars per share) | $ (2.05) | $ (4.27) | $ (8.00)
Weighted-average shares outstanding |  |  |
Basic (in shares) | 612 | 468 | 391
Diluted (in shares) | 612 | 468 | 391
Contract drilling revenues |  |  |
Operating revenues |  |  |
Revenues | $ 3,088 | $ 3,018 | $ 2,731
Other revenues |  |  |
Operating revenues |  |  |
Revenues |  |  | $ 242

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