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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)

X
- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in property, plant and equipment through classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Property, plant and equipment; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in property, plant and equipment resulting from the loss of control of a subsidiary. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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