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Financial Risk Management - Summary of Reconciliation of Components of Equity and Analysis of Movements in Reserves for all Hedges (Detail) $ in Millions	12 Months Ended
	Jun. 30, 2019 USD ($)
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	$ 58
Add: Change in fair value of hedging instrument recognised in OCI	(229)
Less: Reclassified from reserves to interest expense - recognised through OCI	211
At the end of the financial year	40
Cash flow hedging reserve, gross [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	85
Add: Change in fair value of hedging instrument recognised in OCI	(327)
Less: Reclassified from reserves to interest expense - recognised through OCI	229
At the end of the financial year	163
Cash flow hedging reserve, gross [member] | Impact of adopting IFRS 9 [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	176
Cash flow hedging reserve, tax [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	(27)
Add: Change in fair value of hedging instrument recognised in OCI	98
Less: Reclassified from reserves to interest expense - recognised through OCI	(68)
At the end of the financial year	(49)
Cash flow hedging reserve, tax [member] | Impact of adopting IFRS 9 [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	(52)
Cash flow hedging reserve, net [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	58
Add: Change in fair value of hedging instrument recognised in OCI	(229)
Less: Reclassified from reserves to interest expense - recognised through OCI	161
At the end of the financial year	114
Cash flow hedging reserve, net [member] | Impact of adopting IFRS 9 [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	124
Cost of hedging reserve, gross [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Less: Reclassified from reserves to interest expense - recognised through OCI	70
At the end of the financial year	(106)
Cost of hedging reserve, gross [member] | Impact of adopting IFRS 9 [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	(176)
Cost of hedging reserve, tax [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Less: Reclassified from reserves to interest expense - recognised through OCI	(20)
At the end of the financial year	32
Cost of hedging reserve, tax [member] | Impact of adopting IFRS 9 [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	52
Cost of hedging reserve, net [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
Less: Reclassified from reserves to interest expense - recognised through OCI	50
At the end of the financial year	(74)
Cost of hedging reserve, net [member] | Impact of adopting IFRS 9 [member]
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items]
At the beginning of the financial year	$ (124)

X

- Definition

Hedge reserve.

+ References

No definition available.

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 24C
-Subparagraph b
-Clause i
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-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 24E
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24E_a&doctype=Standard
-URIDate 2018-03-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
-Paragraph 91
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_a&doctype=Standard
-URIDate 2018-03-16

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 23
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=b
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- Definition

The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 92
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_92&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 24C
-Subparagraph b
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_b_iv&doctype=Standard
-URIDate 2018-03-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 24E
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24E_a&doctype=Standard
-URIDate 2018-03-16

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 23
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_d&doctype=Standard&book=b
-URIDate 2018-03-16

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