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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year $ 80,497 $ 83,975
Additions 6,644 5,312
Depreciation for the year (7,745) (7,736)
Impairments, net of reversals (838) (160)
Disposals (79) (261)
Transferred to assets held for sale (10,672)  
Exchange variations taken to reserve 1 (1)
Transfers and other movements (626) (438)
At the end of the financial year 67,182 80,497
Divestment and demerger of subsidiaries and operations   (194)
Cost [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 157,666  
At the end of the financial year 126,728 157,666
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year (77,169)  
At the end of the financial year (59,546) (77,169)
Land and buildings [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 8,547 9,005
Additions (20)  
Depreciation for the year (548) (552)
Impairments, net of reversals (9) (8)
Disposals (7) (27)
Transferred to assets held for sale (21)  
Transfers and other movements 210 176
At the end of the financial year 8,152 8,547
Divestment and demerger of subsidiaries and operations   (47)
Land and buildings [Member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 12,387  
At the end of the financial year 12,525 12,387
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 (3,840)  
At the end of the financial year (4,373) (3,840)
Plant and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 49,427 47,766
Additions 110 809
Depreciation for the year (6,467) (6,419)
Impairments, net of reversals (507) (83)
Disposals (26) (56)
Transferred to assets held for sale (4,426)  
Exchange variations taken to reserve 1  
Transfers and other movements 2,773 7,515
At the end of the financial year 40,885 49,427
Divestment and demerger of subsidiaries and operations   (105)
Plant and equipment [Member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 106,332  
At the end of the financial year 91,037 106,332
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 (56,905)  
At the end of the financial year (50,152) (56,905)
Other mineral assets [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 15,557 15,942
Additions 873 416
Depreciation for the year (730) (765)
Impairments, net of reversals (260)  
Disposals (36) (25)
Transferred to assets held for sale (5,563)  
Exchange variations taken to reserve   (1)
Transfers and other movements (867) (10)
At the end of the financial year 8,974 15,557
Other mineral assets [Member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 31,196  
At the end of the financial year 13,212 31,196
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 (15,639)  
At the end of the financial year (4,238) (15,639)
Assets under construction [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 5,536 9,561
Additions 5,423 3,773
Disposals (1) (1)
Transferred to assets held for sale (662)  
Transfers and other movements (2,742) (7,755)
At the end of the financial year 7,554 5,536
Divestment and demerger of subsidiaries and operations   (42)
Assets under construction [Member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 5,538  
At the end of the financial year 7,554 5,538
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 (2)  
At the end of the financial year   (2)
Exploration and evaluation [Member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 1,430 1,701
Additions 258 314
Impairments, net of reversals (62) (69)
Disposals (9) (152)
Transfers and other movements   (364)
At the end of the financial year 1,617 1,430
Exploration and evaluation [Member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [Line Items]    
At the beginning of the financial year 2,213  
At the end of the financial year 2,400 2,213
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 $ (783) $ (783)