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Operating Segments - Geographical Data (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Geographic Data                      
Revenues $ 5,963 $ 5,833 $ 3,225 $ 8,269 $ 9,154 $ 7,886 $ 8,253 $ 8,375 $ 23,290 $ 33,669 $ 34,055
Long-Lived Assets 20,788       21,512       20,788 21,512  
United States                      
Geographic Data                      
Revenues                 17,942 27,162 28,362
Long-Lived Assets 16,896       17,577       16,896 17,577  
Canada                      
Geographic Data                      
Revenues                 5,348 6,507 $ 5,693
Long-Lived Assets $ 3,892       $ 3,935       $ 3,892 $ 3,935