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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, 2023
Jun. 30, 2022
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures $ 11,819 $ 11,363
Recognised in cash flow hedging reserve (15) (59)
Recognised in cost of hedging reserve 1 27
Recognised in the income statement (86) 12
Accrued cash flows (74) 174
Total derivatives fair value 1,572 1,688
Hedged value of notes and debentures 13,565 12,897
Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 956 1,548
Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 790 (14)
USD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 7,245 4,740
Recognised in the income statement 32 (7)
Accrued cash flows 23 86
Total derivatives fair value 269 63
Hedged value of notes and debentures 7,459 4,724
USD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 214 (16)
GBP [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 1,566 2,599
Recognised in cash flow hedging reserve 24 (35)
Recognised in cost of hedging reserve (9) 13
Recognised in the income statement (69) 26
Accrued cash flows 35 42
Total derivatives fair value 777 727
Hedged value of notes and debentures 2,362 3,280
GBP [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 522 796
GBP [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 274 (115)
EUR [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 3,008 3,449
Recognised in cash flow hedging reserve (39) (16)
Recognised in cost of hedging reserve 10 8
Recognised in the income statement (49) (4)
Accrued cash flows (132) 45
Total derivatives fair value 526 730
Hedged value of notes and debentures 3,744 4,146
EUR [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 434 585
EUR [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk $ 302 112
CAD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures   575
Recognised in cash flow hedging reserve   (8)
Recognised in cost of hedging reserve   6
Recognised in the income statement   (3)
Accrued cash flows   1
Total derivatives fair value   168
Hedged value of notes and debentures   747
CAD [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk   167
CAD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk   $ 5