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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, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | $ 3,688 | $ 3,764 |
Deferred tax liabilities | 2,758 | 3,234 |
Charged/(credited) to the income statement | (335) | 81 | $ 1,445
Depreciation [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (2,749) | (1,717) |
Deferred tax liabilities | 1,807 | 1,444 |
Charged/(credited) to the income statement | 1,394 | (951) | (752)
Exploration expenditure [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 398 | 449 |
Charged/(credited) to the income statement | 51 | 43 | 51
Employee benefits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 353 | 310 |
Deferred tax liabilities | (26) | (6) |
Charged/(credited) to the income statement | (38) | 14 | 31
Closure and rehabilitation provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 2,100 | 1,671 |
Deferred tax liabilities | (109) | (203) |
Charged/(credited) to the income statement | (334) | (53) | 218
Resource rent tax [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 359 | 431 |
Deferred tax liabilities | 921 | 1,112 |
Charged/(credited) to the income statement | (119) | (179) | (194)
Other provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 173 | 144 |
Deferred tax liabilities | (239) | (1) |
Charged/(credited) to the income statement | (268) | (2) | (11)
Deferred income [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (4) | 24 |
Deferred tax liabilities | 0 | (5) |
Charged/(credited) to the income statement | 33 | (9) | (13)
Deferred charges [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (383) | (416) |
Deferred tax liabilities | 187 | 286 |
Charged/(credited) to the income statement | (132) | 56 | (119)
Investments, including foreign tax credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 348 | 412 |
Deferred tax liabilities | 458 | 600 |
Charged/(credited) to the income statement | (77) | 70 | 615
Foreign exchange gains and losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (134) | (97) |
Deferred tax liabilities | (61) | (6) |
Charged/(credited) to the income statement | (18) | (45) | (20)
Tax losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 2,759 | 2,611 |
Charged/(credited) to the income statement | (148) | 1,147 | 1,595
Lease [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 548 |  |
Deferred tax liabilities | (245) |  |
Charged/(credited) to the income statement | (793) |  |
Other [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (80) | (58) |
Deferred tax liabilities | 65 | 13 |
Charged/(credited) to the income statement | $ 114 | $ (10) | $ 44

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