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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 29, 2012 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 5,041 | $ 4,310 | $ 3,711 | $ 3,341 | $ 4,377 | $ 3,877 | $ 3,334 | $ 3,242 |  | $ 16,403 | $ 14,830 | $ 14,607
Cost of sales: |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  |  | 10,300 | 10,697 | 10,693
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 1,714 | 2,530 | 3,240
Impairment of Oil and Gas Properties |  |  |  |  |  |  | 200 | 300 | 3,800 |  | 0 | 4,317 | 13,144
Metals inventory adjustments |  |  |  |  |  |  |  |  |  |  | 8 | 36 | 338
Total cost of sales |  |  |  |  |  |  |  |  |  |  | 12,022 | 17,580 | 27,415
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  | 484 | 607 | 558
Mining exploration and research expenses |  |  |  |  |  |  |  |  |  |  | 94 | 64 | 107
Environmental obligations and shutdown costs |  |  |  |  |  |  |  |  |  |  | 251 | 20 | 78
Net gain on sales of assets |  | (15) | (33) | (10) | (23) | 113 | (13) | (749) |  |  | (81) | (649) | (39)
Total costs and expenses |  |  |  |  |  |  |  |  |  |  | 12,770 | 17,622 | 28,119
Operating income (loss) |  | 1,467 | 917 | 669 | 580 | 703 | 359 | 18 | (3,872) |  | 3,633 | (2,792) | (13,512)
Interest expense, net |  |  |  |  |  |  |  |  |  |  | (801) | (755) | (617)
Net gain on early extinguishment and exchanges of debt |  |  |  |  |  |  |  |  |  |  | 21 | 26 | 0
Other income, net |  |  |  |  |  |  |  |  |  |  | 49 | 49 | 1
Income (loss) from continuing operations before income taxes and equity in affiliated companies' net earnings (losses) |  |  |  |  |  |  |  |  |  |  | 2,902 | (3,472) | (14,128)
(Provision for) benefit from income taxes |  |  |  |  |  |  |  |  |  |  | (883) | (371) | 1,951
Equity in affiliated companies’ net earnings (losses) |  |  |  |  |  |  |  |  |  |  | 10 | 11 | (3)
Net income (loss) from continuing operations |  | 1,193 | 242 | 326 | 268 | 202 | 292 | (229) | (4,097) |  | 2,029 | (3,832) | (12,180)
Net income (loss) from discontinued operations |  | 16 | 3 | 9 | 38 | (2) | (6) | (181) | (4) |  | 66 | (193) | 91
Net income (loss) |  | 1,209 | 245 | 335 | 306 | 200 | 286 | (410) | (4,101) |  | 2,095 | (4,025) | (12,089)
Net income attributable to noncontrolling interests: Continuing Operations |  |  |  |  |  |  |  |  |  |  | (274) | (227) | (27)
Net income attributable to noncontrolling interests: Discontinued Operations |  | 0 | 0 | (1) | (3) | (19) | (22) | (12) | (10) |  | (4) | (63) | (79)
Gain on redemption and preferred dividends attributable to redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 0 | 161 | (41)
Net income (loss) attributable to common stockholders |  | $ 1,041 | $ 280 | $ 268 | $ 228 | $ 292 | $ 217 | $ (479) | $ (4,184) |  | $ 1,817 | $ (4,154) | $ (12,236)
Basic and diluted net income (loss) per share attributable to common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  | $ 0.22 | $ 0.18 | $ (0.23) | $ (3.34) |  | $ 1.21 | $ (2.96) | $ (11.32)
Discontinued operations (in dollars per share) |  | $ 0.01 | $ 0.00 | $ 0.00 | $ 0.03 | (0.01) | (0.02) | (0.15) | (0.01) |  | 0.04 | (0.20) | 0.01
Earnings per share, basic and diluted (in dollars per share) |  |  |  |  |  | $ 0.21 | $ 0.16 | $ (0.38) | $ (3.35) |  | $ 1.25 | $ (3.16) | $ (11.31)
Weighted Average Number of Shares Outstanding, Basic |  | 1,448,000,000 | 1,448,000,000 | 1,447,000,000 | 1,446,000,000 | 1,403,000,000 | 1,346,000,000 | 1,269,000,000 | 1,251,000,000 |  | 1,447,000,000 | 1,318,000,000 | 1,082,000,000
Weighted Average Number of Shares Outstanding, Diluted |  | 1,455,000,000.00 | 1,454,000,000.00 | 1,453,000,000.00 | 1,454,000,000.00 | 1,410,000,000 | 1,351,000,000 | 1,269,000,000 | 1,251,000,000 |  | 1,454,000,000.00 | 1,318,000,000 | 1,082,000,000
Dividends declared per share of common stock (in dollars per share) | $ 1.25 |  |  |  |  |  |  |  |  | $ 0.20 | $ 0 | $ 0 | $ 0.2605

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- Definition The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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