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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, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | $ 4,041 | $ 5,788 |
Deferred tax liabilities | 3,472 | 3,765 |
Charged/(credited) to the income statement | 1,445 | (188) | $ (3,508)
Depreciation [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | (2,756) | (3,454) |
Deferred tax liabilities | 1,356 | 1,411 |
Charged/(credited) to the income statement | (752) | 391 | (2,282)
Exploration expenditure [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 492 | 543 |
Deferred tax liabilities |  |  |
Charged/(credited) to the income statement | 51 | (22) | (3)
Employee benefits [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 321 | 379 |
Deferred tax liabilities | (2) | 3 |
Charged/(credited) to the income statement | 31 | (37) | 56
Closure and rehabilitation provisions [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 1,627 | 1,809 |
Deferred tax liabilities | (194) | (230) |
Charged/(credited) to the income statement | 218 | (151) | 36
Resource rent tax [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 468 | 559 |
Deferred tax liabilities | 1,328 | 1,614 |
Charged/(credited) to the income statement | (194) | (189) | (8)
Other provisions [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 141 | 131 |
Deferred tax liabilities | (2) | (1) |
Charged/(credited) to the income statement | (11) | 14 | 8
Deferred income [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 21 | (2) |
Deferred tax liabilities |  | (10) |
Charged/(credited) to the income statement | (13) | 3 | (49)
Deferred charges [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | (374) | (443) |
Deferred tax liabilities | 272 | 322 |
Charged/(credited) to the income statement | (119) | (77) | 62
Investments, including foreign tax credits [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 546 | 1,145 |
Deferred tax liabilities | 691 | 648 |
Charged/(credited) to the income statement | 615 | (17) | (284)
Foreign exchange gains and losses [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | (120) | (87) |
Deferred tax liabilities | 16 | 69 |
Charged/(credited) to the income statement | (20) | (77) | (310)
Tax losses [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | 3,758 | 5,352 |
Deferred tax liabilities |  |  |
Charged/(credited) to the income statement | 1,595 | (381) | (809)
Other [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Deferred tax assets | (83) | (144) |
Deferred tax liabilities | 7 | (61) |
Charged/(credited) to the income statement | $ 44 | $ 355 | $ 75

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