v2.4.0.6
Impairments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairment charges included in discontinued operations $ 471 $ 1,699 $ 66
Impairments 321 81 469
Net properties plants and equipment held for use before tax loss 265 1,604  
Equity method investments of assets before tax loss 399 645  
Net properties, plants and equipment - held for sale   2  
Net proceeds, net properties plants and equipment held for sale   21  
Net properties, plants and equipment (held for sale)   43  
Lower 48 and Latin America, Canada and Europe [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairments     417
Lower 48 and Latin America, Canada and Europe [Member] | Ecuador [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairments     51
Other International [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Equity method investments of assets before tax loss 395    
Trainer [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairment charges included in discontinued operations 467    
Lower 48 and Latin America and Canada [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairments 288    
Wilhelmshaven [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairment charges included in discontinued operations   1,514  
Yanbu [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairment charges included in discontinued operations   98  
Europe and Lower 48 and Latin America [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairments   81  
Discontinued R&M Segment [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Impairment charges included in discontinued operations     66
Fair value [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Net PP&E held for use 162 307  
Equity method investments of assets 274 735  
Net PP&E held for sale   23  
Fair value [Member] | Other International [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Equity method investments of assets 256    
Fair value [Member] | Before write down [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Net PP&E held for use 427 1,911  
Equity method investments of assets   1,380  
Net properties, plants and equipment - held for sale   64  
Fair value [Member] | Before write down [Member] | E&P [Member]
      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Equity method investments of assets $ 651