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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year $ 73,813 $ 72,362
Additions 8,777 10,717
Acquisition of subsidiaries & operations   642
Remeasurements of index-linked freight contracts (369) (59)
Depreciation for the year (6,503) (6,752)
Impairments for the year (515) (2,583)
Disposals (25) (27)
Divestment and demerger of subsidiaries and operations (13,391) (16)
Transfers and other movements (492) (471)
At the end of the financial year 61,295 73,813
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 151,361  
At the end of the financial year 121,130 151,361
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year (77,548)  
At the end of the financial year (59,835) (77,548)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 8,072 8,387
Additions 41 25
Depreciation for the year (663) (694)
Impairments for the year (14) (208)
Disposals (3) (18)
Divestment and demerger of subsidiaries and operations (448)  
Transfers and other movements 1,094 580
At the end of the financial year 8,079 8,072
Land and buildings [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 14,545  
At the end of the financial year 14,823 14,545
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 (6,473)  
At the end of the financial year (6,744) (6,473)
Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 44,682 39,429
Additions 1,935 3,841
Acquisition of subsidiaries & operations   151
Remeasurements of index-linked freight contracts (369) (59)
Depreciation for the year (5,564) (5,748)
Impairments for the year (499) (877)
Disposals (22) (9)
Divestment and demerger of subsidiaries and operations (8,007) (14)
Transfers and other movements 3,344 7,968
At the end of the financial year 35,500 44,682
Plant and equipment [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 108,049  
At the end of the financial year 81,218 108,049
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 (63,367)  
At the end of the financial year (45,718) (63,367)
Other mineral assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 8,941 8,652
Additions 792 797
Acquisition of subsidiaries & operations   491
Depreciation for the year (276) (310)
Impairments for the year (2) (687)
Divestment and demerger of subsidiaries and operations (545)  
Transfers and other movements (416) (2)
At the end of the financial year 8,494 8,941
Other mineral assets [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 15,059  
At the end of the financial year 14,353 15,059
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 (6,118)  
At the end of the financial year (5,859) (6,118)
Assets under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 10,432 13,774
Additions 5,872 5,961
Impairments for the year   (745)
Divestment and demerger of subsidiaries and operations (3,549) (2)
Transfers and other movements (3,724) (8,556)
At the end of the financial year 9,031 10,432
Assets under construction [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 11,177  
At the end of the financial year 9,755 11,177
Assets under construction [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 (745)  
At the end of the financial year (724) (745)
Exploration and evaluation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 1,686 2,120
Additions 137 93
Impairments for the year   (66)
Divestment and demerger of subsidiaries and operations (842)  
Transfers and other movements (790) (461)
At the end of the financial year 191 1,686
Exploration and evaluation [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 2,531  
At the end of the financial year 981 2,531
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 (845)  
At the end of the financial year $ (790) $ (845)