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Properties, Plants and Equipment - Properties, Plants and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 149,209 $ 143,225
Accumulated depreciation, depletion and amortization 65,029 60,671
Property, plant and equipment, net 84,180 [1] 82,554 [1]
E&P [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 124,111 116,805
Accumulated depreciation, depletion and amortization 55,565 50,501
Property, plant and equipment, net 68,546 66,304
Midstream [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 135 128
Accumulated depreciation, depletion and amortization 86 80
Property, plant and equipment, net 49 48
R&M [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 22,096 23,579
Accumulated depreciation, depletion and amortization 8,128 8,999
Property, plant and equipment, net 13,968 14,580
Emerging Businesses [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,023 981
Accumulated depreciation, depletion and amortization 220 161
Property, plant and equipment, net 803 820
Corporate and Other [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,844 1,732
Accumulated depreciation, depletion and amortization 1,030 930
Property, plant and equipment, net $ 814 $ 802
[1] Certain amounts have been restated to reflect a prior period adjustment. See Note 21-Accumulated Other Comprehensive Income, in the Notes to Consolidated Financial Statements.