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Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Statement [Abstract] |  |
Revenues | $ 4,868 | $ 3,341
Cost of sales: |  |
Production and delivery | 2,808 | 2,188
Depreciation, depletion and amortization | 451 | 389
Total cost of sales | 3,259 | 2,577
Selling, general and administrative expenses | 131 | 151
Mining exploration and research expenses | 21 | 14
Environmental obligations and shutdown costs | 9 | 25
Net gain on sales of assets | (11) | (23)
Total costs and expenses | 3,409 | 2,744
Operating income | 1,459 | 597
Interest expense, net | (151) | (167)
Other income, net | 28 | 8
Income from continuing operations before income taxes and equity in affiliated companies’ net (losses) earnings | 1,336 | 438
Provision for income taxes | (506) | (174)
Equity in affiliated companies’ net (losses) earnings | (2) | 4
Net income from continuing operations | 828 | 268
Net (loss) income from discontinued operations | (11) | 38
Net income (loss) | 817 | 306
Net income attributable to noncontrolling interests: |  |
Continuing operations | (125) | (75)
Discontinued operations | 0 | (3)
Net income attributable to common stockholders | $ 692 | $ 228
Basic and diluted net income (loss) per share attributable to common stockholders: |  |
Continuing operations | $ 0.48 | $ 0.13
Discontinued operations | (0.01) | 0.03
Basic and diluted net income (loss) per share attributable to common stockholders: | $ 0.47 | $ 0.16
Basic | 1,449 | 1,446
Diluted | 1,458 | 1,454
Dividends declared per share of common stock | $ 0.05 | $ 0

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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