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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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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 | $ 1,946 | $ 1,844
Tax credits, which are not recognised as deferred tax assets | 1,082 | 843
Gross amount of income tax losses | 6,240 |
Gross amount of tax losses not recognised | 9,855 |
Investments, including foreign tax credits [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Temporary difference for which no deferred tax asset is recognised | 1,659 | 856
Deferred tax liabilities associated with undistributed earnings of subsidiaries that have not been recognised | 2,216 | 2,500
Australian petroleum resource rent tax [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Temporary difference for which no deferred tax asset is recognised | 2,282 | 2,293
Temporary difference for which no deferred tax liability is recognised | 685 | 694
Mineral rights [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Temporary difference for which no deferred tax asset is recognised | 2,263 | 2,293
Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Temporary difference for which no deferred tax asset is recognised | 437 | $ 478
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 | 363 |
In more than one year but not more than two years [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Gross amount of income tax losses | 402 |
In more than two years but not more than five years [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Gross amount of income tax losses | 897 |
Gross amount of capital tax losses | 144 |
Later than five years and not later than 10 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 | 831 |
Gross amount of income tax losses | 398 |
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 | 251 |
Gross amount of income tax losses | 2,446 |
Unlimited [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Gross amount of income tax losses | 1,734 |
Gross amount of capital tax losses | $ 3,471 |

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + Details
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