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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year $ 61,295 $ 73,813
Additions 8,448 8,777
Remeasurements of index-linked freight contracts 53 (369)
Depreciation for the year (4,967) (6,503)
Impairments for the year (73) (515)
Disposals (8) (25)
Divestment and demerger of subsidiaries and operations   (13,391)
Transfers and other movements (606) (492)
At the end of the financial year 71,818 61,295
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 121,130  
At the end of the financial year 135,346 121,130
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year (59,835)  
At the end of the financial year (63,528) (59,835)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 8,079 8,072
Additions 194 41
Depreciation for the year (586) (663)
Impairments for the year   (14)
Disposals (2) (3)
Divestment and demerger of subsidiaries and operations   (448)
Transfers and other movements 367 1,094
At the end of the financial year 8,140 8,079
Land and buildings [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 14,823  
At the end of the financial year 15,258 14,823
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 (6,744)  
At the end of the financial year (7,118) (6,744)
Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 35,500 44,682
Additions 1,024 1,935
Remeasurements of index-linked freight contracts 53 (369)
Depreciation for the year (4,156) (5,564)
Impairments for the year (73) (499)
Disposals (6) (22)
Divestment and demerger of subsidiaries and operations   (8,007)
Transfers and other movements 2,056 3,344
At the end of the financial year 36,654 35,500
Plant and equipment [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 81,218  
At the end of the financial year 85,394 81,218
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 (45,718)  
At the end of the financial year (48,740) (45,718)
Other mineral assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 8,494 8,941
Additions 842 792
Depreciation for the year (225) (276)
Impairments for the year   (2)
Divestment and demerger of subsidiaries and operations   (545)
Transfers and other movements (419) (416)
At the end of the financial year 13,304 8,494
Other mineral assets [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 14,353  
At the end of the financial year 19,420 14,353
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 (5,859)  
At the end of the financial year (6,116) (5,859)
Assets under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 9,031 10,432
Additions 6,332 5,872
Divestment and demerger of subsidiaries and operations   (3,549)
Transfers and other movements (2,602) (3,724)
At the end of the financial year 13,481 9,031
Assets under construction [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 9,755  
At the end of the financial year 14,245 9,755
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 (724)  
At the end of the financial year (764) (724)
Exploration and evaluation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 191 1,686
Additions 56 137
Divestment and demerger of subsidiaries and operations   (842)
Transfers and other movements (8) (790)
At the end of the financial year 239 191
Exploration and evaluation [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 981  
At the end of the financial year 1,029 981
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 (790)  
At the end of the financial year (790) $ (790)
OZ Minerals Limited [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition of subsidiaries & operations 7,676  
OZ Minerals Limited [member] | Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition of subsidiaries & operations 88  
OZ Minerals Limited [member] | Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition of subsidiaries & operations 2,256  
OZ Minerals Limited [member] | Other mineral assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition of subsidiaries & operations 4,612  
OZ Minerals Limited [member] | Assets under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition of subsidiaries & operations $ 720