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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, 2019 | Jun. 30, 2018
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | $ 21,529 | $ 23,298
Recognised in cash flow hedging reserve | (163) | (85)
Recognised in cost of hedging reserve | 106 |
Recognised in the income statement | 68 | 71
Accrued cash flows | 251 | 307
Total derivatives fair value | 204 | 805
Hedged value of notes and debentures | 21,471 | 23,810
Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 1,304 | 1,145
Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (1,362) | $ (633)
USD [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 9,433 |
Recognised in the income statement | 20 |
Accrued cash flows | 111 |
Total derivatives fair value | (122) |
Hedged value of notes and debentures | 9,180 |
USD [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (253) |
GBP [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 3,118 |
Recognised in cash flow hedging reserve | (57) |
Recognised in cost of hedging reserve | 70 |
Recognised in the income statement | (2) |
Accrued cash flows | 62 |
Total derivatives fair value | 234 |
Hedged value of notes and debentures | 3,279 |
GBP [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 678 |
GBP [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (517) |
EUR [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 7,680 |
Recognised in cash flow hedging reserve | (100) |
Recognised in cost of hedging reserve | 33 |
Recognised in the income statement | 54 |
Accrued cash flows | 82 |
Total derivatives fair value | (119) |
Hedged value of notes and debentures | 7,492 |
EUR [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 378 |
EUR [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (566) |
CAD [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount of notes and debentures | 594 |
Recognised in cash flow hedging reserve | (5) |
Recognised in cost of hedging reserve | 3 |
Recognised in the income statement | (4) |
Accrued cash flows | 1 |
Total derivatives fair value | 148 |
Hedged value of notes and debentures | 747 |
CAD [member] | Currency risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | 175 |
CAD [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Risk | (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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_a_i&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 -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_b_ii&doctype=Standard -URIDate 2018-03-16 + Details
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