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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | $ 72,362 | $ 68,041 |
Impact of adopting IFRS 16 |  | 2,154 |
Additions | 10,717 | 8,836 |
Acquisition of subsidiaries & operations | 642 |  |
Remeasurements of index-linked freight contracts | (59) | 733 |
Depreciation for the year | (6,752) | (6,028) |
Impairments for the year | (2,583) | (494) | $ (250)
Disposals | (27) | (99) |
Divestment and demerger of subsidiaries and operations | (16) |  |
Transfers and other movements | (471) | (781) |
At the end of the financial year | 73,813 | 72,362 | 68,041
Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | 141,571 |  |
At the end of the financial year | 151,361 | 141,571 |
Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | (69,209) |  |
At the end of the financial year | (77,548) | (69,209) |
Land and buildings [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | 8,387 | 7,885 |
Impact of adopting IFRS 16 |  | 754 |
Additions | 25 | 115 |
Depreciation for the year | (694) | (630) |
Impairments for the year | (208) | (17) |
Disposals | (18) | (12) |
Transfers and other movements | 580 | 292 |
At the end of the financial year | 8,072 | 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 | 13,932 |  |
At the end of the financial year | 14,545 | 13,932 |
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 | (5,545) |  |
At the end of the financial year | (6,473) | (5,545) |
Plant and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | 39,429 | 38,174 |
Impact of adopting IFRS 16 |  | 1,400 |
Additions | 3,841 | 1,719 |
Acquisition of subsidiaries & operations | 151 |  |
Remeasurements of index-linked freight contracts | (59) | 733 |
Depreciation for the year | (5,748) | (5,104) |
Impairments for the year | (877) | (189) |
Disposals | (9) | (22) |
Divestment and demerger of subsidiaries and operations | (14) |  |
Transfers and other movements | 7,968 | 2,718 |
At the end of the financial year | 44,682 | 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 | 97,230 |  |
At the end of the financial year | 108,049 | 97,230 |
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 | (57,801) |  |
At the end of the financial year | (63,367) | (57,801) |
Other mineral assets [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | 8,652 | 9,211 |
Additions | 797 | 684 |
Acquisition of subsidiaries & operations | 491 |  |
Depreciation for the year | (310) | (294) |
Impairments for the year | (687) | (288) |
Transfers and other movements | (2) | (661) |
At the end of the financial year | 8,941 | 8,652 | 9,211
Other mineral assets [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | 13,736 |  |
At the end of the financial year | 15,059 | 13,736 |
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 | (5,084) |  |
At the end of the financial year | (6,118) | (5,084) |
Assets under construction [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | 13,774 | 11,149 |
Additions | 5,961 | 6,100 |
Impairments for the year | (745) |  |
Divestment and demerger of subsidiaries and operations | (2) |  |
Transfers and other movements | (8,556) | (3,475) |
At the end of the financial year | 10,432 | 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 | 13,774 |  |
At the end of the financial year | 11,177 | 13,774 |
Assets under construction [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the end of the financial year | (745) |  |
Exploration and evaluation [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
At the beginning of the financial year | 2,120 | 1,622 |
Additions | 93 | 218 |
Impairments for the year | (66) |  |
Disposals |  | (65) |
Transfers and other movements | (461) | 345 |
At the end of the financial year | 1,686 | 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 | 2,899 |  |
At the end of the financial year | 2,531 | 2,899 |
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 | (779) |  |
At the end of the financial year | $ (845) | $ (779) |

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