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Financial Risk Management - Summary of Carrying Amounts of Group's Notes and Debentures by Currency and Derivatives Which Hedge (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | $ 14,769 | $ 21,045
Recognised in cash flow hedging reserve | (142) | (71)
Recognised in cost of hedging reserve | 77 | 32
Recognised in the income statement | (18) | 72
Accrued cash flows | 177 | 151
Total derivatives fair value | (557) | (433)
Hedged value of notes and debentures | 14,118 | 20,428
Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 650 | 1,463
Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (1,301) | (2,080)
USD [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 6,270 | 9,926
Recognised in the income statement | 11 | 29
Accrued cash flows | 77 | 74
Total derivatives fair value | (230) | (639)
Hedged value of notes and debentures | 5,952 | 9,184
USD [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (318) | (742)
GBP [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 3,387 | 3,245
Recognised in cash flow hedging reserve | (81) | (16)
Recognised in cost of hedging reserve | 25 | 13
Recognised in the income statement | (34) | (18)
Accrued cash flows | 53 | 47
Total derivatives fair value | (146) | 60
Hedged value of notes and debentures | 3,278 | 3,279
GBP [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 435 | 764
GBP [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (544) | (730)
EUR [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 4,486 | 7,294
Recognised in cash flow hedging reserve | (33) | (55)
Recognised in cost of hedging reserve | 27 | 21
Recognised in the income statement | 7 | 65
Accrued cash flows | 49 | 32
Total derivatives fair value | (295) | (13)
Hedged value of notes and debentures | 4,141 | 7,218
EUR [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 73 | 500
EUR [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (418) | (576)
CAD [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 626 | 580
Recognised in cash flow hedging reserve | (28) |
Recognised in cost of hedging reserve | 25 | (2)
Recognised in the income statement | (2) | (4)
Accrued cash flows | (2) | (2)
Total derivatives fair value | 114 | 159
Hedged value of notes and debentures | 747 | 747
CAD [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 142 | 199
CAD [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | $ (21) | $ (32)

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gains (losses) on hedged items in fair value hedges, which are attributable to the hedged risk. [Refer: Fair value hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_a_ii&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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