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Investments Accounted for Using the Equity Method - Summary of Financial Information of Significant Equity Accounted Investments (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Cash and cash equivalents | $ 15,246 | $ 13,426 | $ 15,613 |
Investment | 1,742 | 2,585 | 2,569 |
Net finance costs | (1,305) | (911) | (1,064) |
Depreciation and amortisation | 6,824 | 6,112 | 5,829 |
Interest income | 73 | 351 | 446 |
Interest expense | 1,378 | 1,262 | 1,510 |
Income tax (expense)/benefit | (11,150) | (4,774) | (5,529) |
Samarco Mineracao S.A. [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Cash and cash equivalents | 134 | 15 |  |
Current financial liabilities (excluding trade and other payables and provisions) | 6,567 | 6,023 |  |
Investment |  |  |  | $ 0
Share of loss |  |  |  | (655)
Impairment |  |  |  | $ (525)
Additional share of loss | (4,442) |  |  |
Loss from funding provided to Samarco | (3,945) |  |  |
Net finance costs | (497) |  |  |
Depreciation and amortisation | 154 | 84 | 85 |
Interest income | 1 | 16 | 22 |
Interest expense | 492 | 588 | 342 |
Income tax (expense)/benefit | (303) | (256) | $ 52 |
Samarco Mineracao S.A. [member] | Working Capital Funding [Member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Additional cumulative impairment losses | (516) |  |  |
Individually immaterial, associates [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Unrecognised share of profits (losses) | 40 | 12 |  |
Cumulative losses | 233 | 193 |  |
Investment | $ 380 | $ 356 |  |

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