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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
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting [Abstract]    
Income (loss) before income taxes $ (1,381) $ (4,628)
(Gains) losses on divestitures, net (2) 334
Exploration expense 126 1,083
DD&A 1,149 1,256
Impairments 16 2,783
Interest expense 220 216
Total (gains) losses on derivatives, net, less net cash from settlement of commodity derivatives 404 243
Restructuring charges 203 0
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net income (loss) attributable to noncontrolling interests 36 32
Consolidated Adjusted EBITDAX 700 1,286
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
Deepwater Horizon [Member] | Pending Litigation [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Other operating expense   4
Deepwater Horizon [Member] | Judicial Ruling [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Other operating expense 1  
Tronox Litigation [Member] | Judicial Ruling [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Other operating expense 0 5
Certain other nonoperating items $ 0 $ (5,210)