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Leases - Summary of Movements in Right of Use Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year $ 3,350 $ 3,047
Additions 866 1,252
Remeasurements of index-linked freight contracts (369) (59)
Depreciation expensed during the period (975) (781)
Depreciation classified as exploration (3) (19)
Impairments for the year (7) (32)
Divestment and demerger of subsidiaries and operations (429)  
Transfers and other movements (72) (58)
At the end of the financial year 2,361 3,350
Gross carrying amount [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 5,290  
At the end of the financial year 5,052 5,290
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year (1,940)  
At the end of the financial year (2,691) (1,940)
Land and buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 638 689
Additions 41 25
Depreciation expensed during the period (103) (111)
Impairments for the year (7) (30)
Divestment and demerger of subsidiaries and operations (116)  
Transfers and other movements (1) 65
At the end of the financial year 452 638
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 897  
At the end of the financial year 745 897
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 (259)  
At the end of the financial year (293) (259)
Plant and equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
At the beginning of the financial year 2,712 2,358
Additions 825 1,227
Remeasurements of index-linked freight contracts (369) (59)
Depreciation expensed during the period (872) (670)
Depreciation classified as exploration (3) (19)
Impairments for the year   (2)
Divestment and demerger of subsidiaries and operations (313)  
Transfers and other movements (71) (123)
At the end of the financial year 1,909 2,712
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 4,393  
At the end of the financial year 4,307 4,393
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 (1,681)  
At the end of the financial year $ (2,398) $ (1,681)