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Income Tax Expense - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 AUD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 AUD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2018 AUD ($) | Jun. 30, 2018 USD ($) | May 31, 2017 AUD ($) | May 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | May 31, 2016 AUD ($) | May 31, 2016 USD ($) | Apr. 30, 2014 AUD ($) | Apr. 30, 2014 USD ($)
Income tax expense benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed tax amount |  | $ 3,609 |  |  |  | $ 3,503 |  |  |  |  |  |  |
Tax and other matters [member] | Transfer pricing [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed tax amount |  |  | $ 143 |  |  |  |  |  | $ 105 | $ 537 | $ 396 | $ 362 | $ 267
Payments for assessments | $ 52 | $ 39 | $ 276 | $ 221 |  |  |  |  |  |  |  |  |
Tax and other matters [member] | Controlled foreign companies [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed tax amount |  |  |  |  | $ 43 | $ 32 | $ 39 | $ 29 |  |  |  |  |

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