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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]        
Income (loss) before income taxes $ 463 $ 390 $ 2,929 $ 3,019
Exploration expense 272 297 714 1,662
DD&A 996 979 2,958 2,936
Impairments 593 4 632 166
Interest expense 177 185 513 561
Deepwater Horizon settlement and related costs 5 4 12 15
Algeria exceptional profits tax settlement 0 7 33 (1,797)
Segment Reporting Information [Line Items]        
Unrealized (gains) losses on derivatives, net     (359) 539
Certain other nonoperating items     0 (250)
Less net income attributable to noncontrolling interests 41 21 95 67
Consolidated Adjusted EBITDAX 2,491 2,301 7,412 6,786
Certain Other Nonoperating Items [Member]
       
Segment Reporting Information [Line Items]        
Certain other nonoperating items (10) 0 75 0
Gathering, Processing, and Marketing Sales and Gains (Losses) on Derivatives, Net [Member]
       
Segment Reporting Information [Line Items]        
Unrealized (gains) losses on derivatives, net 36 456 (359) 539
Realized (gains) losses on interest-rate and other derivatives, net 28 (197) (37) (598)
(Gains) Losses on Derivatives, net [Member] | Interest-Rate and Other Derivatives [Member]
       
Segment Reporting Information [Line Items]        
Unrealized (gains) losses on derivatives, net (74) 14 (428) 152
Realized (gains) losses on interest-rate and other derivatives, net 0 0 0 2
Tronox Litigation [Member]
       
Segment Reporting Information [Line Items]        
Tronox-related contingent loss $ 0 $ 0 $ 0 $ (250)