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Provisions - Summary of Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about provisions [line items]    
Beginning Balance $ 7,179 $ 2,824
Acquisitions through business combination [1]   4,804
Change in provision 541 (559)
Unwinding of present value discount 237 110
Ending Balance 7,957 7,179
Current 1,506 1,219
Non-current 6,451 5,960
Net carrying amount 7,957 7,179
Restoration [member]    
Disclosure of detailed information about provisions [line items]    
Beginning Balance [2] 6,253 2,218
Acquisitions through business combination [1],[2]   4,310
Change in provision [2] 664 (382)
Unwinding of present value discount [2] 237 107
Ending Balance [2] 7,154 6,253
Current [2] 1,011 575
Non-current [2] 6,143 5,678
Net carrying amount [2] 7,154 6,253
Employee benefits [member]    
Disclosure of detailed information about provisions [line items]    
Beginning Balance 517 286
Acquisitions through business combination [1]   329
Change in provision 5 (98)
Unwinding of present value discount 0 0
Ending Balance 522 517
Current 351 331
Non-current 171 186
Net carrying amount 522 517
Onerous contracts [member]    
Disclosure of detailed information about provisions [line items]    
Beginning Balance 0 214
Acquisitions through business combination [1]   0
Change in provision 0 (216)
Unwinding of present value discount 0 2
Ending Balance 0 0
Current 0 0
Non-current 0 0
Net carrying amount 0 0
Other [member]    
Disclosure of detailed information about provisions [line items]    
Beginning Balance 409 106
Acquisitions through business combination [1]   165
Change in provision (128) 137
Unwinding of present value discount 0 1
Ending Balance 281 409
Current 144 313
Non-current 137 96
Net carrying amount $ 281 $ 409
[1] Refer to Note B.5 for details of business combination.
[2] 2023 change in provision is due to increase in estimates of $1,111 million and accretion of $237 million offset by provisions used of $447 million. Changes in estimates are due to new activities, revisions to cost and removal scope assumptions and rate escalations, supported by the most recent estimates and benchmarks and the alignment of the ‘expected value approach’ across all assets.