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Operating Segments and Geographic Data (Details 2) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Sales and Other Operating Revenues        
Sales and other operating revenues $ 66,671 [1] $ 51,051 [1] $ 125,083 [1] $ 97,792 [1]
Upstream [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 7,801 6,649 14,618 13,612
Upstream [Member] | United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 7,357 5,722 14,023 12,315
Upstream [Member] | International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 14,538 10,110 27,407 19,658
Upstream [Member] | Subtotal [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 21,895 15,832 41,430 31,973
Upstream [Member] | Intersegment Elimination - United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues (4,897) (3,370) (9,162) (6,843)
Upstream [Member] | Intersegment Elimination - International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues (9,197) (5,813) (17,650) (11,518)
Downstream [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 58,738 44,268 110,189 83,903
Downstream [Member] | United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 24,612 19,222 46,046 36,940
Downstream [Member] | International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 34,180 25,093 64,237 47,060
Downstream [Member] | Subtotal [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 58,792 44,315 110,283 84,000
Downstream [Member] | Intersegment Elimination - United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues (23) (21) (43) (49)
Downstream [Member] | Intersegment Elimination - International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues (31) (26) (51) (48)
All Other Segments [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 132 134 276 277
All Other Segments [Member] | United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 397 381 762 675
All Other Segments [Member] | International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 12 18 22 33
All Other Segments [Member] | Subtotal [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 409 399 784 708
All Other Segments [Member] | Intersegment Elimination - United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues (266) (254) (488) (413)
All Other Segments [Member] | Intersegment Elimination - International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues (11) (11) (20) (18)
Sales and Other Operating Revenue [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 66,671 51,051 125,083 97,792
Sales and Other Operating Revenue [Member] | United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 32,366 25,325 60,831 49,930
Sales and Other Operating Revenue [Member] | International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 48,730 35,221 91,666 66,751
Sales and Other Operating Revenue [Member] | Subtotal [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues 81,096 60,546 152,497 116,681
Sales and Other Operating Revenue [Member] | Intersegment Elimination - United States [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues (5,186) (3,645) (9,693) (7,305)
Sales and Other Operating Revenue [Member] | Intersegment Elimination - International [Member]
       
Sales and Other Operating Revenues        
Sales and other operating revenues $ (9,239) $ (5,850) $ (17,721) $ (11,584)
[1] Includes excise, value-added and similar taxes.