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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, 2020 | Jun. 30, 2019
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | $ 21,045 | $ 21,529
Recognised in cash flow hedging reserve | (71) | (163)
Recognised in cost of hedging reserve | 32 | 106
Recognised in the income statement | 72 | 68
Accrued cash flows | 151 | 251
Total derivatives fair value | (433) | 204
Hedged value of notes and debentures | 20,428 | 21,471
Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 1,463 | 1,304
Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (2,080) | (1,362)
USD [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 9,926 | 9,433
Recognised in cash flow hedging reserve | 0 |
Recognised in cost of hedging reserve | 0 |
Recognised in the income statement | 29 | 20
Accrued cash flows | 74 | 111
Total derivatives fair value | (639) | (122)
Hedged value of notes and debentures | 9,184 | 9,180
USD [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 0 |
USD [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (742) | (253)
GBP [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 3,245 | 3,118
Recognised in cash flow hedging reserve | (16) | (57)
Recognised in cost of hedging reserve | 13 | 70
Recognised in the income statement | (18) | (2)
Accrued cash flows | 47 | 62
Total derivatives fair value | 60 | 234
Hedged value of notes and debentures | 3,279 | 3,279
GBP [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 764 | 678
GBP [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (730) | (517)
EUR [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 7,294 | 7,680
Recognised in cash flow hedging reserve | (55) | (100)
Recognised in cost of hedging reserve | 21 | 33
Recognised in the income statement | 65 | 54
Accrued cash flows | 32 | 82
Total derivatives fair value | (13) | (119)
Hedged value of notes and debentures | 7,218 | 7,492
EUR [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 500 | 378
EUR [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (576) | (566)
CAD [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 580 | 594
Recognised in cash flow hedging reserve | 0 | (5)
Recognised in cost of hedging reserve | (2) | 3
Recognised in the income statement | (4) | (4)
Accrued cash flows | (2) | 1
Total derivatives fair value | 159 | 148
Hedged value of notes and debentures | 747 | 747
CAD [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 199 | 175
CAD [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | $ (32) | (22)
AUD [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures |  | 704
Recognised in cash flow hedging reserve |  | (1)
Accrued cash flows |  | (5)
Total derivatives fair value |  | 63
Hedged value of notes and debentures |  | 773
AUD [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk |  | 73
AUD [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk |  | $ (4)

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2019-03-27 + Details
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