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Segment Information - Reconciliation of Consolidated Adjusted EBITDAX to Income (Loss) before Income Taxes Table (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting [Abstract]        
Income (loss) before income taxes $ 694 $ 1,526 $ (1,268) $ 2,466
Exploration expense 502 178 801 442
DD&A 1,048 940 2,172 1,962
Impairments 117 10 120 39
Interest expense 186 172 369 336
Total (gains) losses on derivatives, net, less net cash from settlement of commodity derivatives 237 (641) 600 (395)
Deepwater Horizon settlement and related costs 93 4 93 7
Algeria exceptional profits tax settlement 0 0 0 33
Tronox-related contingent loss 19 0 4,319 0
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Less net income attributable to noncontrolling interests 39 30 82 54
Consolidated Adjusted EBITDAX 2,857 2,244 7,124 4,921
Certain Other Nonoperating Items [Member]
       
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Certain other nonoperating items $ 0 $ 85 $ 0 $ 85