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Segment Information - Reconciliation of Consolidated Adjusted EBITDAX to Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Income (loss) before income taxes $ 683 $ (1,066) $ 1,125 $ (1,616)
Interest expense 240 230 705 682
DD&A 1,130 1,083 3,123 3,235
Exploration expense 118 [1] 750 380 [1] 2,366
(Gains) losses on divestitures, net (3) 194 (31) (815)
Impairments 172 0 319 383
Total (gains) losses on derivatives, net, less net cash from settlement of commodity derivatives (167) 98 73 (12)
Restructuring charges 13 3 13 20
Less net income (loss) attributable to noncontrolling interests 64 58 105 182
Consolidated Adjusted EBITDAX 2,122 $ 1,234 5,602 $ 4,061
Exploration Expense [Member]        
Segment Reporting Information [Line Items]        
Restructuring charges $ 20   $ 20  
[1] Includes restructuring charges of $20 million for the three and nine months ended September 30, 2018.