v2.4.0.6
Segment Disclosures and Related Information - Geographic Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales and other operating revenues $ 65,756 $ 57,296 $ 48,828
United States [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, domestic 33,750 32,246 32,841
Sales and Other Operating Revenues, domestic 32,790 29,305 24,591
Australia [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 12,572 12,461 10,729
Sales and Other Operating Revenues, foreign 3,458 2,789 2,229
Canada [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 20,083 20,439 22,451
Sales and Other Operating Revenues, foreign 5,326 5,350 4,709
China [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 2,449 2,656 2,849
Sales and Other Operating Revenues, foreign 2,154 1,870 1,076
Indonesia [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 1,726 1,745 2,072
Sales and Other Operating Revenues, foreign 2,076 1,696 1,419
Norway [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 5,918 5,664 5,797
Sales and Other Operating Revenues, foreign 5,755 4,692 4,101
Russia [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 341 815 8,383
Sales and Other Operating Revenues, foreign         
United Kingdom [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 3,257 2,975 3,768
Sales and Other Operating Revenues, foreign 11,314 8,110 7,751
Other foreign countries [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 11,465 10,265 8,704
Sales and Other Operating Revenues, foreign 2,883 3,484 2,952
Discontinued operations [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 25,279 25,523 26,746
Sales and Other Operating Revenues, foreign         
Worldwide Consolidated [Member]
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets, foreign 116,840 114,789 124,340
Sales and other operating revenues $ 65,756 $ 57,296 $ 48,828