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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, 2024
Jun. 30, 2023
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures $ 14,932 $ 11,819
Recognised in cash flow hedging reserve (40) (15)
Recognised in cost of hedging reserve 10 1
Recognised in the income statement (117) (86)
Accrued and other cash flows (350) (74)
Total derivatives fair value 1,395 1,572
Hedged value of notes and debentures 16,824 13,565
Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 888 956
Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 1,004 790
USD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 10,928 7,245
Recognised in the income statement 2 32
Accrued and other cash flows (48) 23
Total derivatives fair value 452 269
Hedged value of notes and debentures 11,426 7,459
USD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 498 214
GBP [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 1,595 1,566
Recognised in cash flow hedging reserve (13) 24
Recognised in cost of hedging reserve 3 (9)
Recognised in the income statement (69) (69)
Accrued and other cash flows (16) 35
Total derivatives fair value 673 777
Hedged value of notes and debentures 2,363 2,362
GBP [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 521 522
GBP [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 247 274
EUR [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 2,409 3,008
Recognised in cash flow hedging reserve (27) (39)
Recognised in cost of hedging reserve 7 10
Recognised in the income statement (50) (49)
Accrued and other cash flows (286) (132)
Total derivatives fair value 270 526
Hedged value of notes and debentures 3,035 3,744
EUR [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 367 434
EUR [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk $ 259 $ 302