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Operating Segments (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues and long lived assets attributable to geographic areas                      
Revenues $ 10,631 $ 10,703 $ 10,295 $ 10,620 $ 9,439 $ 9,354 $ 9,786 $ 9,218 $ 42,249 $ 37,797 $ 34,275
Long Lived Assets 15,366       14,078       15,366 14,078  
United States
                     
Revenues and long lived assets attributable to geographic areas                      
Revenues                 32,924 29,978 28,181
Long Lived Assets 11,743       10,401       11,743 10,401  
Canada
                     
Revenues and long lived assets attributable to geographic areas                      
Revenues                 9,325 7,819 6,094
Long Lived Assets $ 3,623       $ 3,677       $ 3,623 $ 3,677