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Investments Accounted for Using the Equity Method - Summary of Movements of Investments Accounted for using the Equity Method (Parenthetical) (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 28, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Impairment of the carrying value of the investment in Cerrejón |  | $ 2,635 | $ 494 | $ 264
Profit/(loss) from equity accounted investments, related impairments and expenses |  | (921) | (512) | (546)
Funding provided during the period |  | (219) |  |
Fair value change on forward exchange derivatives |  | (145) | $ (422) | (8)
Consideration on sale of investments accounted for using equity method |  |  |  | $ 10,427
Carbonesdel Cerrejon Limited Liability Corporation [Member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Impairment of the carrying value of the investment in Cerrejón |  | 466 |  |
Percentage of divestiture of interest in associates accounted for using equity method | 33.30% |  |  |
Consideration on sale of investments accounted for using equity method | $ 294 |  |  |
Carbonesdel Cerrejon Limited Liability Corporation [Member] | Non-current assets held for sale [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Investments in associates accounted for using equity method |  | 284 |  |
Samarco dam failure [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Fair value change on forward exchange derivatives |  | 136 |  |
Samarco germano dam decommissioning [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Change in estimate |  | 6 |  |
Exchange translation |  | (21) |  |
Samarco Germano dam decommissioning |  | (15) |  |
Joint ventures [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Profit/(loss) from equity accounted investments, related impairments and expenses |  | (990) |  |
Funding provided during the period |  | (111) |  |
Joint ventures [member] | Samarco dam failure [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Profit/(loss) from equity accounted investments, related impairments and expenses |  | 990 |  |
Funding provided during the period |  | (111) |  |
Samarco dam failure provision |  | (1,000) |  |
Change in estimate |  | (842) |  |
Exchange translation |  | (158) |  |
Impairment funding provided |  | $ (111) |  |

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