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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year $ 68,041 $ 67,182
Impact of adopting IFRS 16 2,154  
Additions 8,836 7,760
Remeasurements of index-linked freight contracts 733  
Depreciation for the year (6,028) (5,747)
Impairments, net of reversals (494) (250)
Disposals (99) (47)
Transferred to assets held for sale   (331)
Exchange variations taken to reserve   (1)
Transfers and other movements (781) (525)
At the end of the financial year 72,362 68,041
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 132,149  
At the end of the financial year 141,571 132,149
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year (64,108)  
At the end of the financial year (69,209) (64,108)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 7,885 8,152
Impact of adopting IFRS 16 754  
Additions 115 5
Depreciation for the year (630) (585)
Impairments, net of reversals (17) (9)
Disposals (12) (2)
Transfers and other movements 292 324
At the end of the financial year 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 12,825  
At the end of the financial year 13,932 12,825
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 (4,940)  
At the end of the financial year (5,545) (4,940)
Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 38,174 40,885
Impact of adopting IFRS 16 1,400  
Additions 1,719 515
Remeasurements of index-linked freight contracts 733  
Depreciation for the year (5,104) (4,885)
Impairments, net of reversals (189) (234)
Disposals (22) (40)
Exchange variations taken to reserve   (1)
Transfers and other movements 2,718 1,934
At the end of the financial year 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 92,090  
At the end of the financial year 97,230 92,090
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 (53,916)  
At the end of the financial year (57,801) (53,916)
Mineral rights and petroleum interests [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 9,211 8,974
Additions 684 1,023
Depreciation for the year (294) (277)
Impairments, net of reversals (288)  
Disposals   (5)
Transfers and other movements (661) (504)
At the end of the financial year 8,652 9,211
Mineral rights and petroleum interests [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 13,681  
At the end of the financial year 13,736 13,681
Mineral rights and petroleum interests [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 (4,470)  
At the end of the financial year (5,084) (4,470)
Assets under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 11,149 7,554
Additions 6,100 5,799
Transferred to assets held for sale   (331)
Transfers and other movements (3,475) (1,873)
At the end of the financial year 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 11,149  
At the end of the financial year 13,774 11,149
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 0  
At the end of the financial year   0
Exploration and evaluation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 1,622 1,617
Additions 218 418
Impairments, net of reversals   (7)
Disposals (65)  
Transfers and other movements 345 (406)
At the end of the financial year 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 2,404  
At the end of the financial year 2,899 2,404
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 (782)  
At the end of the financial year $ (779) $ (782)