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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year $ 67,182 $ 80,497
Additions 7,760 6,644
Depreciation for the year (5,747) (7,745)
Impairments, net of reversals (250) (838)
Disposals (47) (79)
Transferred to assets held for sale (331) (10,672)
Exchange variations taken to reserve (1) 1
Transfers and other movements (525) (626)
At the end of the financial year 68,041 67,182
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 126,728  
At the end of the financial year 132,149 126,728
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year (59,546)  
At the end of the financial year (64,108) (59,546)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 8,152 8,547
Additions 5 (20)
Depreciation for the year (585) (548)
Impairments, net of reversals (9) (9)
Disposals (2) (7)
Transferred to assets held for sale   (21)
Transfers and other movements 324 210
At the end of the financial year 7,885 8,152
Land and buildings [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 12,525  
At the end of the financial year 12,825 12,525
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 (4,373)  
At the end of the financial year (4,940) (4,373)
Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 40,885 49,427
Additions 515 110
Depreciation for the year (4,885) (6,467)
Impairments, net of reversals (234) (507)
Disposals (40) (26)
Transferred to assets held for sale   (4,426)
Exchange variations taken to reserve (1) 1
Transfers and other movements 1,934 2,773
At the end of the financial year 38,174 40,885
Plant and equipment [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 91,037  
At the end of the financial year 92,090 91,037
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 (50,152)  
At the end of the financial year (53,916) (50,152)
Mineral rights and petroleum interests [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 8,974 15,557
Additions 1,023 873
Depreciation for the year (277) (730)
Impairments, net of reversals   (260)
Disposals (5) (36)
Transferred to assets held for sale   (5,563)
Transfers and other movements (504) (867)
At the end of the financial year 9,211 8,974
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 13,212  
At the end of the financial year 13,681 13,212
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 (4,238)  
At the end of the financial year (4,470) (4,238)
Assets under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 7,554 5,536
Additions 5,799 5,423
Disposals   (1)
Transferred to assets held for sale (331) (662)
Transfers and other movements (1,873) (2,742)
At the end of the financial year 11,149 7,554
Assets under construction [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 7,554  
At the end of the financial year 11,149 7,554
Exploration and evaluation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 1,617 1,430
Additions 418 258
Impairments, net of reversals (7) (62)
Disposals   (9)
Transfers and other movements (406)  
At the end of the financial year 1,622 1,617
Exploration and evaluation [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
At the beginning of the financial year 2,400  
At the end of the financial year 2,404 2,400
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 (783)  
At the end of the financial year $ (782) $ (783)