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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
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]      
Income (loss) before income taxes $ 2,106 $ 3,565 $ (3,424)
Exploration expense 1,329 1,946 1,076
DD&A 3,927 3,964 3,830
Impairments 794 389 1,774
Interest expense 686 742 839
Total (gains) losses on derivatives, net, less net cash received in settlement of commodity derivatives (307) 443 675
Deepwater Horizon settlement and related costs 15 18 3,930
Algeria exceptional profits tax settlement 33 (1,797) 0
Segment Reporting Information [Line Items]      
Tronox-related contingent loss 850 (250) 250
Certain other nonoperating items 850 (250) 250
Less net income attributable to noncontrolling interests 140 54 81
Consolidated Adjusted EBITDAX 9,403 8,966 8,869
Certain Other Nonoperating Items [Member]
     
Segment Reporting Information [Line Items]      
Certain other nonoperating items $ 110 $ 0 $ 0