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Impairment of Non-current Assets - Schedule of Impairment of Non-current Assets for Cash Generating Unit by Class of Assets and by Reportable Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | $ 3,101 | $ 494 |
Total impairment of non-current assets | 2,583 | 494 | $ 250
Total impairment of non-current assets | 52 |  | $ 14
Net impairment of non-current assets | 3,101 | 494 |
Property, plant and equipment [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | 2,583 | 494 |
Goodwill and other intangible assets [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | 52 |  |
Equity- accounted investment [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | 466 |  |
Total impairment of non-current assets | 466 |  |
New South Wales Energy Coal [Member] | Coal [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | 1,057 |  |
Total impairment of non-current assets | 1,025 |  |
Total impairment of non-current assets | 32 |  |
Cerrejon [Member] | Coal [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | 466 |  |
Total impairment of non-current assets | 466 |  |
Potash [Member] | G&U [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | 1,314 |  |
Total impairment of non-current assets | 1,314 |  |
Cerro Colorado [Member] | Copper [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets |  | 409 |
Total impairment of non-current assets |  | 409 |
Other [Member] |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |
Total impairment of non-current assets | 264 | 85 |
Total impairment of non-current assets | 244 | $ 85 |
Total impairment of non-current assets | $ 20 |  |

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- Definition Impairment​ loss​ of non current ​assets​ net of reversal. + References No definition available. + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets and goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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