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Income Tax Expense - Additional Information (Detail) $ in Millions, $ in Millions | Nov. 19, 2018 USD ($) | Nov. 19, 2018 AUD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 AUD ($) | Jun. 30, 2018 USD ($)
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Disclosure of significant subsidiaries [line items] |  |  |  |  |
Assessed tax amount |  |  | $ 3,443 |  | $ 3,503
Tax and other matters [member] | Controlled foreign companies [member] |  |  |  |  |
Disclosure of significant subsidiaries [line items] |  |  |  |  |
Assessed tax amount |  |  | 87 | $ 125 |
Tax and other matters [member] | Controlled foreign companies [member] | Litigated [member] |  |  |  |  |
Disclosure of significant subsidiaries [line items] |  |  |  |  |
Assessed tax amount |  |  | $ 30 | $ 43 |
Tax and other matters [member] | Transfer pricing [member] |  |  |  |  |
Disclosure of significant subsidiaries [line items] |  |  |  |  |
Payments for assessments | $ 388 | $ 529 |  |  |
Tax and other matters [member] | Transfer pricing [member] | Prior years [member] |  |  |  |  |
Disclosure of significant subsidiaries [line items] |  |  |  |  |
Payments for assessments | 243 | 328 |  |  |
Tax and other matters [member] | Transfer pricing [member] | Current period [member] |  |  |  |  |
Disclosure of significant subsidiaries [line items] |  |  |  |  |
Payments for assessments | $ 145 | $ 201 |  |  |

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