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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Operating revenues |  |  |  |
Contract drilling revenues | $ 705 | $ 915 | $ 1,443 | $ 2,026
Other revenues | 46 | 25 | 93 | 255
Total operating revenues | 751 | 940 | 1,536 | 2,281
Costs and expenses |  |  |  |
Operating and maintenance | 333 | 497 | 676 | 1,152
Depreciation | 219 | 225 | 451 | 442
General and administrative | 35 | 41 | 74 | 84
Total costs and expenses | 587 | 763 | 1,201 | 1,678
Loss on impairment | (113) | (12) | (113) | (15)
Loss on disposal of assets, net | (1,595) | (2) | (1,593) | (1)
Operating income (loss) | (1,544) | 163 | (1,371) | 587
Other income (expense), net |  |  |  |
Interest income | 7 | 4 | 13 | 10
Interest expense, net of amounts capitalized | (129) | (98) | (256) | (187)
Gain (loss) on retirement of debt | (48) | 38 | (48) | 38
Other, net | (2) | 3 | 1 | 2
Total other income (expense), net | (172) | (53) | (290) | (137)
Income (loss) from continuing operations before income tax expense | (1,716) | 110 | (1,661) | 450
Income tax expense (benefit) | (37) | 18 | (77) | 116
Income (loss) from continuing operations | (1,679) | 92 | (1,584) | 334
Income from discontinued operations, net of tax |  | 1 |  |
Net income (loss) | (1,679) | 93 | (1,584) | 334
Net income attributable to noncontrolling interest | 11 | 11 | 15 | 17
Net income (loss) attributable to controlling interest | $ (1,690) | $ 82 | $ (1,599) | $ 317
Earnings (loss) per share-basic |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) | $ (4.32) | $ 0.22 | $ (4.09) | $ 0.86
Earnings (loss) per share (in dollars per share) | (4.32) | 0.22 | (4.09) | 0.86
Earnings (loss) per share-diluted |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) | (4.32) | 0.22 | (4.09) | 0.86
Earnings (loss) per share (in dollars per share) | $ (4.32) | $ 0.22 | $ (4.09) | $ 0.86
Weighted-average shares outstanding |  |  |  |
Basic (in shares) | 391 | 365 | 391 | 365
Diluted (in shares) | 391 | 365 | 391 | 365

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