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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
Mar. 31, 2013
Mar. 31, 2012
Reconciliation of Consolidated Adjusted EBITDAX to Income (Loss) before Income Taxes [Abstract]    
Income (loss) before income taxes $ 940 $ 2,535
Exploration expense 264 244
DD&A 1,022 930
Impairments 29 50
Deepwater Horizon settlement and related costs 3 8
Algeria exceptional profits tax settlement 33 (1,804)
Segment Reporting Information [Line Items]    
Unrealized (gains) losses on derivatives, net 246 (142)
Interest expense 164 186
Less net income attributable to noncontrolling interests 24 27
Consolidated Adjusted EBITDAX 2,677 2,255
Gathering, Processing, and Marketing Sales and Gains (Losses) on Derivatives, Net [Member]
   
Segment Reporting Information [Line Items]    
Unrealized (gains) losses on derivatives, net 246 (142)
Tronox Litigation [Member]
   
Segment Reporting Information [Line Items]    
Tronox-related contingent loss   $ 275