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Decommissioning and Other Provisions (Tables)
 12 Months Ended
Dec. 31, 2021
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Change in decommissioning and other provision balances
The change in decommissioning and other provision balances is as follows:
 
Decommissioning and
restoration
Other provisionsTotal
Balance, Dec. 31, 2019501 45 546 
Liabilities incurred1 34 35 
Liabilities settled(18)(19)(37)
Accretion30 — 30 
Acquisition of liabilities1 — 1 
Revisions in estimated cash flows61 11 72 
Revisions in discount rates(1)
36 — 36 
Reversals— (6)(6)
Change in foreign exchange rates(4)— (4)
Balance, Dec. 31, 2020608 65 673 
Liabilities incurred8 22 30 
Liabilities settled (Note 36)(18)(62)(80)
Accretion32 — 32 
Acquisition of liabilities2 — 2 
Revisions in estimated cash flows167 12 179 
Revisions in discount rates(6)— (6)
Reversals— (3)(3)
Balance, Dec. 31, 2021793 34 827 
(1) Discount rates at Dec. 31, 2020, are generally lower than those at Dec. 31, 2019, due to decreases in the underlying risk-free US and Canadian benchmark yields and changes in credit spreads due to volatility within the market as a result of COVID-19. On average, these rates decreased by approximately 0.3 to 0.9 per cent.

 Decommissioning and
restoration		OtherTotal
Balance, Dec. 31, 2020608 65 673 
Current portion21 38 59 
Non-current portion587 27 614 
Balance, Dec. 31, 2021793 34 827 
Current portion35 13 48 
Non-current portion758 21 779