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Contributed Equity - Summary of Issued and Fully Paid Shares (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]      
Beginning balance $ 37,127 $ 14,229 $ 12,875
Ordinary shares issued for the acquisition of BHPP1   19,265  
Transaction costs associated with the issue of shares   (5)  
Ending balance $ 35,170 $ 37,127 $ 14,229
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Beginning balance, shares 1,898,749,771 969,631,826 962,225,814
Beginning balance $ 29,001 $ 9,409 $ 9,297
Transaction costs associated with the issue of shares $ 0 $ (5)  
Ending balance, shares 1,898,749,771 1,898,749,771 969,631,826
Ending balance $ 29,001 $ 29,001 $ 9,409
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 BHPP1   $ 19,265  
Ordinary shares [member] | 2021 dividend [member]      
Disclosure of classes of share capital [line items]      
Number of shares issued, shares   14,348,997 6,051,940
Ordinary shares issued   $ 332 $ 86
Ordinary shares [member] | 2020 dividend [member]      
Disclosure of classes of share capital [line items]      
Number of shares issued, shares     1,354,072
Ordinary shares issued     $ 26