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Operating Segments - Geographic Data (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Geographic Data                      
Total revenues $ 4,996 $ 5,551 $ 6,663 $ 5,942 $ 9,459 $ 11,127 $ 11,195 $ 11,684 $ 23,152 $ 43,464 $ 42,249
Long-Lived Assets 19,310       17,992       19,310 17,992  
United States                      
Geographic Data                      
Total revenues                 18,701 34,860 32,924
Long-Lived Assets 15,942       14,342       15,942 14,342  
Canada                      
Geographic Data                      
Total revenues                 4,451 8,604 $ 9,325
Long-Lived Assets $ 3,368       $ 3,650       $ 3,368 $ 3,650