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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year $ 72,362 $ 68,041  
Impact of adopting IFRS 16   2,154  
Additions 10,717 8,836  
Acquisition of subsidiaries & operations 642    
Remeasurements of index-linked freight contracts (59) 733  
Depreciation for the year (6,752) (6,028)  
Impairments for the year (2,583) (494) $ (250)
Disposals (27) (99)  
Divestment and demerger of subsidiaries and operations (16)    
Transfers and other movements (471) (781)  
At the end of the financial year 73,813 72,362 68,041
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 141,571    
At the end of the financial year 151,361 141,571  
Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year (69,209)    
At the end of the financial year (77,548) (69,209)  
Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 8,387 7,885  
Impact of adopting IFRS 16   754  
Additions 25 115  
Depreciation for the year (694) (630)  
Impairments for the year (208) (17)  
Disposals (18) (12)  
Transfers and other movements 580 292  
At the end of the financial year 8,072 8,387 7,885
Land and buildings [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 13,932    
At the end of the financial year 14,545 13,932  
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year (5,545)    
At the end of the financial year (6,473) (5,545)  
Plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 39,429 38,174  
Impact of adopting IFRS 16   1,400  
Additions 3,841 1,719  
Acquisition of subsidiaries & operations 151    
Remeasurements of index-linked freight contracts (59) 733  
Depreciation for the year (5,748) (5,104)  
Impairments for the year (877) (189)  
Disposals (9) (22)  
Divestment and demerger of subsidiaries and operations (14)    
Transfers and other movements 7,968 2,718  
At the end of the financial year 44,682 39,429 38,174
Plant and equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 97,230    
At the end of the financial year 108,049 97,230  
Plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year (57,801)    
At the end of the financial year (63,367) (57,801)  
Other mineral assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 8,652 9,211  
Additions 797 684  
Acquisition of subsidiaries & operations 491    
Depreciation for the year (310) (294)  
Impairments for the year (687) (288)  
Transfers and other movements (2) (661)  
At the end of the financial year 8,941 8,652 9,211
Other mineral assets [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 13,736    
At the end of the financial year 15,059 13,736  
Other mineral assets [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year (5,084)    
At the end of the financial year (6,118) (5,084)  
Assets under construction [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 13,774 11,149  
Additions 5,961 6,100  
Impairments for the year (745)    
Divestment and demerger of subsidiaries and operations (2)    
Transfers and other movements (8,556) (3,475)  
At the end of the financial year 10,432 13,774 11,149
Assets under construction [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 13,774    
At the end of the financial year 11,177 13,774  
Assets under construction [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the end of the financial year (745)    
Exploration and evaluation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 2,120 1,622  
Additions 93 218  
Impairments for the year (66)    
Disposals   (65)  
Transfers and other movements (461) 345  
At the end of the financial year 1,686 2,120 $ 1,622
Exploration and evaluation [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year 2,899    
At the end of the financial year 2,531 2,899  
Exploration and evaluation [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
At the beginning of the financial year (779)    
At the end of the financial year $ (845) $ (779)