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Leases - Summary of Movements in Right of Use Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year $ 2,361 $ 3,350
Additions 542 866
Remeasurements of index-linked freight contracts 53 (369)
Depreciation expensed during the period (533) (975)
Depreciation classified as exploration   (3)
Impairments for the year   (7)
Divestment and demerger of subsidiaries and operations   (429)
Transfers and other movements (37) (72)
At the end of the financial year 2,809 2,361
OZ Minerals Limited [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Acquisition of subsidiaries and operations 423  
Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 5,052  
At the end of the financial year 4,846 5,052
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year (2,691)  
At the end of the financial year (2,037) (2,691)
Land and buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 452 638
Additions 192 41
Depreciation expensed during the period (71) (103)
Impairments for the year   (7)
Divestment and demerger of subsidiaries and operations   (116)
Transfers and other movements   (1)
At the end of the financial year 573 452
Land and buildings [member] | Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 745  
At the end of the financial year 758 745
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year (293)  
At the end of the financial year (185) (293)
Plant and equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 1,909 2,712
Additions 350 825
Remeasurements of index-linked freight contracts 53 (369)
Depreciation expensed during the period (462) (872)
Depreciation classified as exploration   (3)
Divestment and demerger of subsidiaries and operations   (313)
Transfers and other movements (37) (71)
At the end of the financial year 2,236 1,909
Plant and equipment [member] | OZ Minerals Limited [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Acquisition of subsidiaries and operations 423  
Plant and equipment [member] | Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 4,307  
At the end of the financial year 4,088 4,307
Plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year (2,398)  
At the end of the financial year $ (1,852) $ (2,398)