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Segment Information - Reconciliation of Consolidated Adjusted EBITDAX to Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting [Abstract]        
Income (loss) before income taxes $ 142 $ (372) $ 442 $ (550)
Interest expense 237 229 465 452
DD&A 1,003 1,037 1,993 2,152
Exploration expense 94 532 262 1,616
(Gains) losses on divestitures, net (52) (205) (28) (1,009)
Impairments 128 10 147 383
Total (gains) losses on derivatives, net, less net cash from settlement of commodity derivatives 267 45 240 (110)
Restructuring charges 0 18 0 17
Less net income (loss) attributable to noncontrolling interests (12) 81 41 124
Consolidated Adjusted EBITDAX $ 1,831 $ 1,213 $ 3,480 $ 2,827