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Leases - Summary of Movements in Right of Use Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | $ 3,047 | $ 492
Assets recognised on adoption of IFRS 16 |  | 2,154
Additions | 1,252 | 436
Remeasurements of index-linked freight contracts | (59) | 733
Depreciation expensed during the period | (781) | (656)
Depreciation classified as exploration | (19) | (34)
Impairments | (32) | (24)
Transfers and other movements | (58) | (54)
At the end of the financial year | 3,350 | 3,047
Gross carrying amount [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | 4,153 |
At the end of the financial year | 5,290 | 4,153
Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | (1,106) |
At the end of the financial year | (1,940) | (1,106)
Land and buildings [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | 689 |
Assets recognised on adoption of IFRS 16 |  | 754
Additions | 25 | 104
Depreciation expensed during the period | (111) | (113)
Impairments | (30) | (2)
Transfers and other movements | 65 | (54)
At the end of the financial year | 638 | 689
Land and buildings [member] | Gross carrying amount [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | 804 |
At the end of the financial year | 897 | 804
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | (115) |
At the end of the financial year | (259) | (115)
Plant and equipment [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | 2,358 | 492
Assets recognised on adoption of IFRS 16 |  | 1,400
Additions | 1,227 | 332
Remeasurements of index-linked freight contracts | (59) | 733
Depreciation expensed during the period | (670) | (543)
Depreciation classified as exploration | (19) | (34)
Impairments | (2) | (22)
Transfers and other movements | (123) |
At the end of the financial year | 2,712 | 2,358
Plant and equipment [member] | Gross carrying amount [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | 3,349 |
At the end of the financial year | 4,393 | 3,349
Plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
At the beginning of the financial year | (991) |
At the end of the financial year | $ (1,681) | $ (991)

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