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Income Tax Expense - Summary of Factors Affecting Income Tax Expense (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income tax expense benefits [line items]
Australian prima facie tax rate	30.00%	30.00%	30.00%
US tax reform [member]
Income tax expense benefits [line items]
Repatriation tax			$ 797
Previously unrecognised tax credits			$ 603

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- Definition

Income tax expense benefits.

+ References

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- Definition

Tax effect from previously unrecognised tax credits.

+ References

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- Definition

Tax effect from repatriation tax.

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- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2019-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2019-03-27

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