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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, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | $ 3,764 | $ 4,041 |
Deferred tax liabilities | 3,234 | 3,472 |
Charged/(credited) to the income statement | 81 | 1,445 | $ (188)
Depreciation [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (1,717) | (2,756) |
Deferred tax liabilities | 1,444 | 1,356 |
Charged/(credited) to the income statement | (951) | (752) | 391
Exploration expenditure [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 449 | 492 |
Charged/(credited) to the income statement | 43 | 51 | (22)
Employee benefits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 310 | 321 |
Deferred tax liabilities | (6) | (2) |
Charged/(credited) to the income statement | 14 | 31 | (37)
Closure and rehabilitation provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 1,671 | 1,627 |
Deferred tax liabilities | (203) | (194) |
Charged/(credited) to the income statement | (53) | 218 | (151)
Resource rent tax [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 431 | 468 |
Deferred tax liabilities | 1,112 | 1,328 |
Charged/(credited) to the income statement | (179) | (194) | (189)
Other provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 144 | 141 |
Deferred tax liabilities | (1) | (2) |
Charged/(credited) to the income statement | (2) | (11) | 14
Deferred income [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 24 | 21 |
Deferred tax liabilities | (5) |  |
Charged/(credited) to the income statement | (9) | (13) | 3
Deferred charges [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (416) | (374) |
Deferred tax liabilities | 286 | 272 |
Charged/(credited) to the income statement | 56 | (119) | (77)
Investments, including foreign tax credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 412 | 546 |
Deferred tax liabilities | 600 | 691 |
Charged/(credited) to the income statement | 70 | 615 | (17)
Foreign exchange gains and losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (97) | (120) |
Deferred tax liabilities | (6) | 16 |
Charged/(credited) to the income statement | (45) | (20) | (77)
Tax losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 2,611 | 3,758 |
Charged/(credited) to the income statement | 1,147 | 1,595 | (381)
Other [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | (58) | (83) |
Deferred tax liabilities | 13 | 7 |
Charged/(credited) to the income statement | $ (10) | $ 44 | $ 355

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