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Segment Reporting Information by Business Segments (Detail) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Segment Reporting Disclosure [Line Items]     
Total Assets$ 15,491,082,000 $ 15,491,082,000 $ 14,233,243,000
External Revenues7,240,443,0005,200,334,000[1]20,928,041,00014,605,643,000[1] 
Intersegment Revenues42,700,00033,500,000[1]137,400,00073,900,000[1] 
Income (Loss)406,114,000202,832,000[1]986,630,000624,012,000[1] 
United Kingdom | Exploration and production
     
Segment Reporting Disclosure [Line Items]     
Total Assets205,400,000 205,400,000  
External Revenues20,200,00028,000,000[1]83,900,000109,500,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)(11,500,000)4,900,000[1]6,800,00029,900,000[1] 
Malaysia | Exploration and production
     
Segment Reporting Disclosure [Line Items]     
Total Assets3,487,000,000 3,487,000,000  
External Revenues484,800,000453,400,000[1]1,442,100,0001,386,700,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)197,700,000167,600,000[1]559,500,000499,300,000[1] 
United States | Exploration and production
     
Segment Reporting Disclosure [Line Items]     
Total Assets1,752,700,000 1,752,700,000  
External Revenues173,200,000155,200,000[1]539,700,000497,800,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)38,200,00014,600,000[1]106,800,00047,800,000[1] 
Republic of the Congo | Exploration and production
     
Segment Reporting Disclosure [Line Items]     
Total Assets706,000,000 706,000,000  
External Revenues43,700,00046,600,000[1]111,400,000100,300,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)(700,000)(20,200,000)[1](400,000)(26,600,000)[1] 
Canada | Exploration and production
     
Segment Reporting Disclosure [Line Items]     
Total Assets3,467,600,000 3,467,600,000  
External Revenues307,400,000170,500,000[1]827,700,000593,900,000[1] 
Intersegment Revenues42,700,00033,500,000[1]137,400,00073,900,000[1] 
Income (Loss)102,300,00039,100,000[1]284,500,000150,600,000[1] 
Exploration and production
     
Segment Reporting Disclosure [Line Items]     
Total Assets9,687,600,000[2] 9,687,600,000[2]  
External Revenues1,029,300,000[2]854,100,000[1],[2]3,029,200,000[2]2,691,200,000[1],[2] 
Intersegment Revenues42,700,000[2]33,500,000[1],[2]137,400,000[2]73,900,000[1],[2] 
Income (Loss)261,900,000[2]186,700,000[1],[2]765,600,000[2]652,800,000[1],[2] 
Exploration and production | Other Regions
     
Segment Reporting Disclosure [Line Items]     
Total Assets68,900,000 68,900,000  
External Revenues0400,000[1]24,400,0003,000,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)(64,100,000)(19,300,000)[1](191,600,000)(48,200,000)[1] 
United Kingdom | Refining and Marketing
     
Segment Reporting Disclosure [Line Items]     
Total Assets1,157,400,000 1,157,400,000  
External Revenues1,552,100,000930,500,000[1]4,499,000,0001,889,500,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)(19,100,000)(13,800,000)[1](43,600,000)(24,400,000)[1] 
United States | Refining and Marketing
     
Segment Reporting Disclosure [Line Items]     
Total Assets2,241,800,000 2,241,800,000  
External Revenues4,629,200,0003,424,600,000[1]13,356,100,00010,083,500,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)88,000,00059,000,000[1]172,900,000135,200,000[1] 
Refining and Marketing
     
Segment Reporting Disclosure [Line Items]     
Total Assets3,399,200,000 3,399,200,000  
External Revenues6,181,300,0004,355,100,000[1]17,855,100,00011,973,000,000[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)68,900,00045,200,000[1]129,300,000110,800,000[1] 
Total Operating Segments
     
Segment Reporting Disclosure [Line Items]     
Total Assets13,086,800,000 13,086,800,000  
External Revenues7,210,600,0005,209,200,000[1]20,884,300,00014,664,200,000[1] 
Intersegment Revenues42,700,00033,500,000[1]137,400,00073,900,000[1] 
Income (Loss)330,800,000231,900,000[1]894,900,000763,600,000[1] 
Corporate
     
Segment Reporting Disclosure [Line Items]     
Total Assets1,859,300,000 1,859,300,000  
External Revenues29,800,000(8,900,000)[1]43,700,000(58,600,000)[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)4,900,000(34,500,000)[1](40,700,000)(133,500,000)[1] 
Assets/revenue/income from continuing operations
     
Segment Reporting Disclosure [Line Items]     
Total Assets14,946,100,000 14,946,100,000  
External Revenues7,240,400,0005,200,300,000[1]20,928,000,00014,605,600,000[1] 
Intersegment Revenues42,700,00033,500,000[1]137,400,00073,900,000[1] 
Income (Loss)335,700,000197,400,000[1]854,200,000630,100,000[1] 
Discontinued Operations, net of tax
     
Segment Reporting Disclosure [Line Items]     
Total Assets545,000,000 545,000,000  
External Revenues00[1]00[1] 
Intersegment Revenues00[1]00[1] 
Income (Loss)$ 70,400,000$ 5,400,000[1]$ 132,400,000$ (6,100,000)[1] 
[1]Reclassified to conform to current presentation
[2]Additional details about results of oil and gas operations are presented in the tables on pages 26 and 27.