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Contributed Equity - Summary of Issued and Fully Paid Shares (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Disclosure of classes of share capital [line items]      
Beginning balance $ 35,170 $ 36,684 $ 37,127
Ending balance $ 35,829 $ 35,170 $ 36,684
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Beginning balance, shares 1,898,749,771   1,898,749,771
Beginning balance $ 29,001   $ 29,001
Ending balance, shares 1,898,749,771 1,898,749,771  
Ending balance $ 29,001 $ 29,001