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Segment Information - Reconciliation of Consolidated Adjusted EBITDAX to Income (Loss) Before Income Taxes Table (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]            
Income (loss) before income taxes $ (3,077) $ 1,774     $ (7,520) $ 506
Exploration expense 1,074 199     2,260 1,000
DD&A 1,111 1,163     3,581 3,335
Impairments 758 394     3,571 514
Interest expense 199 204     616 573
Total (gains) losses on derivatives, net, less net cash from settlement of commodity derivatives 360 (276)     374 324
Net income attributable to noncontrolling interests 75 60     154 142
Consolidated Adjusted EBITDAX 350 3,442     2,759 10,566
Certain Other Nonoperating Items [Member]            
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]            
Certain other nonoperating items 0 22     22 22
Deepwater Horizon [Member] | Pending Litigation [Member]            
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]            
Litigation-related contingent loss 0 3     4 96
Certain other nonoperating items         0 93
Tronox Litigation [Member] | Judicial Ruling [Member]            
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]            
Litigation-related contingent loss $ 0 $ 19 $ 4,300 $ 850 5 4,338
Certain other nonoperating items         $ (5,210) $ 4,338