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Decommissioning and Other Provisions (Tables)
 12 Months Ended
Dec. 31, 2022
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Disclosure of 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, 2020608 65 673 
Liabilities incurred8 22 30 
Liabilities settled(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 
Liabilities incurred1 23 24 
Liabilities settled(35)(12)(47)
Accretion (Note 10)
49 — 49 
Disposals(5)— (5)
Revisions in estimated cash flows95 5 100 
Revisions in discount rates(225)— (225)
Reversals— (9)(9)
Change in foreign exchange rates15 — 15 
Balance, Dec. 31, 2022688 41 729 
Included in the Consolidated Statements of Financial Position as:
As at Dec. 31,
20222021
Current portion70 48 
Non-current portion659 779 
Total Decommissioning and other provisions729 827