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Closure and Rehabilitation Provisions - Summary of Closure and Rehabilitation Provisions (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of other provisions [Line Items] |  |  |
Current | $ 2,025 | $ 1,959 |
Non-current | 8,223 | 8,445 |
Closure and rehabilitation provisions [Member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
At the beginning of the financial year | 6,738 | 6,502 |
Increases to existing and new provisions | 132 | 127 |
Exchange translation | (11) | 9 |
Released during the year | (165) | (120) |
Amortisation of discounting impacting net finance costs | 352 | 330 |
Utilised | (178) | (132) |
Exchange variations impacting foreign currency translation reserve |  | (1) |
Divestment and demerger of subsidiaries and operations |  | (146) |
Transferred to liabilities held for sale | (450) |  |
Other movements | (1) | (1) |
At the end of the financial year | 6,330 | 6,738 | $ 6,502
Current | 274 | 255 |
Non-current | 6,056 | 6,483 |
Closure and rehabilitation provisions [Member] | Operating sites [Member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
At the beginning of the financial year | 5,462 |  |
Change in estimate | 35 | 71 |
Exchange translation | (122) | 99 |
At the end of the financial year | 5,120 | 5,462 |
Closure and rehabilitation provisions [Member] | Closed sites [Member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
At the beginning of the financial year | 1,276 |  |
Increases to existing and new provisions | (21) | 33 | $ 18
At the end of the financial year | $ 1,210 | $ 1,276 |

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