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Contributed Equity - Summary of Issued and Fully Paid Shares (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]      
Beginning balance $ 14,229 $ 12,875 $ 17,409
Ordinary shares issued     23
Ordinary shares issued for the acquisition of BHPP1 19,265    
Transaction costs associated with the issue of shares (5)    
Ending balance $ 37,127 $ 14,229 $ 12,875
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Beginning balance, shares 969,631,826 962,225,814 942,286,900
Beginning balance $ 9,409 $ 9,297 $ 9,010
Transaction costs associated with the issue of shares $ (5)    
Ending balance, shares 1,898,749,771 969,631,826 962,225,814
Ending balance $ 29,001 $ 9,409 $ 9,297
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    
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 6,091,035
Ordinary shares issued   $ 26 $ 83
Ordinary shares [member] | 2019 dividend [member]      
Disclosure of classes of share capital [line items]      
Number of shares issued, shares     12,072,034
Ordinary shares issued     $ 181
Ordinary shares [member] | 2017 Woodside equity plan [member]      
Disclosure of classes of share capital [line items]      
Number of shares issued, shares     1,775,845
Ordinary shares issued     $ 23