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Contributed Equity - Summary of Issued and Fully Paid Shares (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]      
Beginning balance $ 35,170 $ 37,127 $ 14,229
Ordinary shares issued for the acquisition of BHPP     19,265
Transaction costs associated with the issue of shares     (5)
Ending balance $ 36,153 $ 35,170 $ 37,127
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Beginning balance, shares 1,898,749,771 1,898,749,771 969,631,826
Beginning balance $ 29,001 $ 29,001 $ 9,409
Transaction costs associated with the issue of shares $ (5)
Ending balance, shares 1,898,749,771 1,898,749,771 1,898,749,771
Ending balance $ 29,001 $ 29,001 $ 29,001
Ordinary shares [member] | BHP Petroleum International Pty Ltd [member]      
Disclosure of classes of share capital [line items]      
Number of shares issued, shares 914,768,948   914,768,948
Ordinary shares issued for the acquisition of BHPP     $ 19,265
Ordinary shares [member] | 2021 dividend [member]      
Disclosure of classes of share capital [line items]      
Number of shares issued, shares     14,348,997
Ordinary shares issued     $ 332