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Properties, Plants and Equipment (Properties, Plants and Equipment with Associated Accumulated Depreciation and Amortization) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Gross PP&E $ 23,567 $ 23,156 [1]
Accum. D&A 8,256 8,385 [1]
Net PP&E 15,311 14,771 [1]
R&M [Member]
   
Property, Plant and Equipment [Line Items]    
Gross PP&E 22,627 23,078 [1]
Accum. D&A 7,816 8,327 [1]
Net PP&E 14,811 14,751 [1]
R&M [Member] | Refining [Member]
   
Property, Plant and Equipment [Line Items]    
Gross PP&E 18,751 19,333 [1]
Accum. D&A 5,988 6,630 [1]
Net PP&E 12,763 12,703 [1]
R&M [Member] | Transportation [Member]
   
Property, Plant and Equipment [Line Items]    
Gross PP&E 2,458 2,359 [1]
Accum. D&A 1,015 931 [1]
Net PP&E 1,443 1,428 [1]
R&M [Member] | Marketing And Other [Member]
   
Property, Plant and Equipment [Line Items]    
Gross PP&E 1,418 1,386 [1]
Accum. D&A 813 766 [1]
Net PP&E 605 620 [1]
Midstream [Member]
   
Property, Plant and Equipment [Line Items]    
Gross PP&E 63 64 [1]
Accum. D&A 49 51 [1]
Net PP&E 14 13 [1]
Corporate And Other [Member]
   
Property, Plant and Equipment [Line Items]    
Gross PP&E 877 14 [1]
Accum. D&A 391 7 [1]
Net PP&E $ 486 $ 7 [1]
[1] Certain PP&E within the R&M segment have been reclassified between "Refining" and "Marketing and other."