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Taxation - Summary of prima facie tax reconciliation (Detail) - USD ($)
$ in Millions
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2024
Oct. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Line Items]          
Profit before taxation     $ 15,615 $ 13,785 $ 18,662
Prima facie tax payable at UK rate     3,904 3,239 3,546
Higher rate of taxation of 30% on Australian earnings     613 835 1,550
Other tax rates applicable outside the UK and Australia     (303) (2) (17)
Tax effect of profit from equity accounted units, related impairments and expenses     (210) (159) (109)
Impact of changes in tax rates     (15) (173) (11)
Resource depletion allowances     (10) (11) (40)
Recognition of previously unrecognised deferred tax assets     (640) (157) (261)
Write-down of previously recognised deferred tax assets     203 0 932
Utilisation of previously unrecognised deferred tax assets     (42) (10) (37)
Unrecognised current year operating losses     185 567 212
Uncertain tax provision     295 0 0
Deferred tax arising on internal sale of assets in Canadian operations     0 (364) 0
Adjustments in respect of prior periods     (13) 31 (222)
Other items     74 36 71
Total taxation charge     $ 4,041 $ 3,832 $ 5,614
Weighted average statutory corporation tax rate     29.00% 31.00% 29.00%
Deferred tax arising on internal sale of assets in Canadian operations     $ 0 $ 364 $ 0
Current tax expense related to Pillar Two income taxes     $ 1    
Energy Resources of Australia Ltd          
Income Taxes [Line Items]          
Group interest (voting %) 98.43% 86.30% 98.43%    
Australia          
Income Taxes [Line Items]          
Recognition of previously unrecognised deferred tax assets     $ 443    
Mongolia          
Income Taxes [Line Items]          
Uncertain tax provision     $ 295