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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Income and capital tax losses with a tax benefit, which are not recognised as deferred tax assets | $ 3,569 | $ 2,405
Tax credits, which are not recognised as deferred tax assets | 2,375 | 1,683
Gross amount of income tax losses not recognised | 9,718 | 8,559
Gross amount of tax losses not recognized | 13,956 | 12,709
Tax effect of total losses not recognised | 3,569 | 2,405
Due not later than one year [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of income tax losses not recognised | 13 | 474
Gross amount of capital tax losses not recognised | 0 | 0
Later than one year and not later than two years [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of income tax losses not recognised | 5 | 240
Later than two years and not later than five years [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of income tax losses not recognised | 105 | 2,525
Gross amount of capital tax losses not recognised | 0 | 0
Later than five years and not later than 10 years [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of income tax losses not recognised | 1,449 | 679
Later than 10 years and not later than 20 years [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits, which are not recognised as deferred tax assets | 570 |
Gross amount of income tax losses not recognised | 3,347 | 2,379
Unlimited [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross amount of income tax losses not recognised | 4,799 | 2,262
Gross amount of capital tax losses not recognised | 4,238 | $ 4,150
Not Later than 10 year[member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits, which are not recognised as deferred tax assets | $ 1,805 |

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