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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Minimum commitments for unrecorded unconditional purchase obligations At December 31, 2021, 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, 2021, were as follows (in millions):
Total Minimum
Commitments
2022$1,335 
20231,045 
2024823 
2025673 
2026579 
2027 and beyond2,133 
 $6,588