Deferred Tax Balances - Summary of Movement in Net Deferred Tax Position (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Income tax (charge)/credit recorded in the income statement	$ (1,445)	$ 188	$ 3,508
Discontinued operations [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Income tax (charge)/credit recorded in the income statement	$ 510	$ 219	$ 2,990

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
-Subparagraph g
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard
-URIDate 2017-03-09

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration