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Decommissioning and Other Provisions (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2021793 34 827 
Liabilities incurred1 23 24 
Liabilities settled(35)(12)(47)
Accretion49 — 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 
Liabilities incurred1 4 5 
Liabilities settled(37)(13)(50)
Accretion (Note 10)
47 1 48 
Revisions in estimated cash flows(89)— (89)
Revisions in discount rates52 — 52 
Change in foreign exchange rates(6)— (6)
Balance, Dec. 31, 2023656 33 689 
Included in the Consolidated Statements of Financial Position as:
As atDec. 31, 2023Dec. 31, 2022
Current portion35 70 
Non-current portion654 659 
Total Decommissioning and other provisions689 729