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Impairment of Non-current Assets - Summary of Impairment of Non-current Assets Excluding Goodwill (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 impairment of non-current assets excluding goodwill [line items] |  |  |
Total impairment of non-current assets | $ 2,635 | $ 494 | $ 264
New South Wales Energy Coal [Member] |  |  |
Disclosure of detailed information about impairment of non-current assets excluding goodwill [line items] |  |  |
Negative recoverable​ amount​ of asset​ or cash generating​ unit | (300) |  |
Total impairment of non-current assets | $ 1,057 |  |
Discount rate applied | 6.50% |  |
Cerrejon [Member] |  |  |
Disclosure of detailed information about impairment of non-current assets excluding goodwill [line items] |  |  |
Recoverable amount of asset or cash-generating unit | $ 284 |  |
Total impairment of non-current assets | 466 |  |
Consideration on sale of investments accounted for using equity method | 294 |  |
Expected Net Proceeds From Sale Of Investments Accounted For Using Equity Method | 284 |  |
Potash [Member] |  |  |
Disclosure of detailed information about impairment of non-current assets excluding goodwill [line items] |  |  |
Recoverable amount of asset or cash-generating unit | 3,300 |  |
Total impairment of non-current assets | $ 1,300 |  |
Discount rate applied | 6.50% |  |

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