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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Minimum commitments for unrecorded unconditional purchase obligations At December 31, 2020, total minimum commitments from purchase and service obligations and transportation and storage service commitments not qualifying as leases, based on current transportation and storage rates and the foreign currency exchange rates used to convert Canadian dollars into United States dollars at December 31, 2020, were as follows (in millions):
Total Minimum
Commitments
2021$1,393 
20221,263 
20231,064 
2024790 
2025649 
2026 and beyond2,764 
 $7,923