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Provisions - Summary of Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about provisions [line items]    
Beginning Balance $ 7,957 $ 7,179
Acquisitions through business combination and asset acquisitions [1] 168  
Change in provision (871) 541
Unwinding of present value discount 293 237
Ending Balance 7,547 7,957
Current 1,322 1,506
Non-current 6,225 6,451
Net carrying amount 7,547 7,957
Restoration [member]    
Disclosure of detailed information about provisions [line items]    
Beginning Balance [2] 7,154 6,253
Acquisitions through business combination and asset acquisitions [1],[2] 16  
Change in provision [2] (936) 664
Unwinding of present value discount [2] 292 237
Ending Balance [2] 6,526 7,154
Current [2] 753 1,011
Non-current [2] 5,773 6,143
Net carrying amount [2] 6,526 7,154
Employee benefits [member]    
Disclosure of detailed information about provisions [line items]    
Beginning Balance 522 517
Acquisitions through business combination and asset acquisitions [1] 104  
Change in provision 28 5
Unwinding of present value discount 0 0
Ending Balance 654 522
Current 402 351
Non-current 252 171
Net carrying amount 654 522
Other [member]    
Disclosure of detailed information about provisions [line items]    
Beginning Balance 281 409
Acquisitions through business combination and asset acquisitions [1] 48  
Change in provision 37 (128)
Unwinding of present value discount 1 0
Ending Balance 367 281
Current 167 144
Non-current 200 137
Net carrying amount $ 367 $ 281
[1] Refer to Note B.5 for details of business combination and Note B.7 for details of asset acquisitions.
[2] 2024 change in provision is due to provisions used of $887 million, changes in macroeconomic factors increasing the provisions by $647 million, offset by changes in estimates of $598 million. Changes in estimates are due to new activities, revisions to cost and removal scope assumptions and rate changes supported by most recent estimates and benchmarks.