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Operating Segments (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues and long lived assets attributable to geographic areas                      
Revenues $ 8,884 $ 8,837 $ 8,859 $ 7,694 $ 7,231 $ 6,414 $ 6,124 $ 6,125 $ 34,275 $ 25,893 $ 18,520
Long-Lived Assets 11,010       9,302       11,010 9,302  
United States
                      
Revenues and long lived assets attributable to geographic areas                      
Revenues                 28,181 21,471 15,439
Long-Lived Assets 9,127       7,502       9,127 7,502  
Canada
                      
Revenues and long lived assets attributable to geographic areas                      
Revenues                 6,094 4,422 3,081
Long-Lived Assets $ 1,883       $ 1,800       $ 1,883 $ 1,800