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Deferred Tax Balances - Summary of Composition of Net Deferred Tax Assets and Liabilities and Deferred Tax Expense Charged/(Credited) to Income Statement (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | $ 1,912 | $ 3,688 |
Deferred tax liabilities | 3,314 | 3,779 |
Charged/(credited) to the income statement | 1,325 | (335) | $ 81
Depreciation [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (1,349) | (2,749) |
Deferred tax liabilities | 4,716 | 2,828 |
Charged/(credited) to the income statement | 488 | 1,394 | (951)
Exploration expenditure [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 51 | 398 |
Charged/(credited) to the income statement | 347 | 51 | 43
Employee benefits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 94 | 353 |
Deferred tax liabilities | (333) | (26) |
Charged/(credited) to the income statement | (68) | (38) | 14
Closure and rehabilitation provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 638 | 2,100 |
Deferred tax liabilities | (2,086) | (109) |
Charged/(credited) to the income statement | (515) | (334) | (53)
Resource rent tax [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 122 | 359 |
Deferred tax liabilities | 368 | 921 |
Charged/(credited) to the income statement | (309) | (119) | (179)
Other provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 108 | 173 |
Deferred tax liabilities | (227) | (239) |
Charged/(credited) to the income statement | 77 | (268) | (2)
Deferred income [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 11 | (4) |
Deferred tax liabilities | (16) |  |
Charged/(credited) to the income statement | (31) | 33 | (9)
Deferred charges [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (36) | (383) |
Deferred tax liabilities | 602 | 187 |
Charged/(credited) to the income statement | 68 | (132) | 56
Investments, including foreign tax credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 147 | 348 |
Deferred tax liabilities | 671 | 458 |
Charged/(credited) to the income statement | 414 | (77) | 70
Foreign exchange gains and losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (3) | (134) |
Deferred tax liabilities | 133 | (61) |
Charged/(credited) to the income statement | 63 | (18) | (45)
Tax losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 1,999 | 2,759 |
Deferred tax liabilities | (82) |  |
Charged/(credited) to the income statement | 678 | (148) | 1,147
Lease liability [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 68 | 548 |
Deferred tax liabilities | (658) | (245) |
Charged/(credited) to the income statement | 67 | (793) |
Other [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 62 | (80) |
Deferred tax liabilities | 226 | 65 |
Charged/(credited) to the income statement | $ 46 | $ 114 | $ (10)

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