XML 75 R93.htm IDEA: XBRL DOCUMENT v2.4.0.6
Operating Segments (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues and long lived assets attributable to geographic areas                      
Revenues $ 9,439 $ 9,354 $ 9,786 $ 9,218 $ 8,884 $ 8,837 $ 8,859 $ 7,694 $ 37,797 $ 34,275 $ 25,893
Long Lived Assets 14,078       11,010       14,078 11,010  
United States
                     
Revenues and long lived assets attributable to geographic areas                      
Revenues                 29,978 28,181 21,471
Long Lived Assets 10,401       9,127       10,401 9,127  
Canada
                     
Revenues and long lived assets attributable to geographic areas                      
Revenues                 7,819 6,094 4,422
Long Lived Assets $ 3,677       $ 1,883       $ 3,677 $ 1,883