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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, 2022
Jun. 30, 2021
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures $ 11,363 $ 14,769
Recognised in cash flow hedging reserve (59) (142)
Recognised in cost of hedging reserve 27 77
Recognised in the income statement 12 (18)
Accrued cash flows 174 177
Total derivatives fair value 1,688 (557)
Hedged value of notes and debentures 12,897 14,118
Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 1,548 650
Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (14) (1,301)
USD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 4,740 6,270
Recognised in the income statement (7) 11
Accrued cash flows 86 77
Total derivatives fair value 63 (230)
Hedged value of notes and debentures 4,724 5,952
USD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (16) (318)
GBP [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 2,599 3,387
Recognised in cash flow hedging reserve (35) (81)
Recognised in cost of hedging reserve 13 25
Recognised in the income statement 26 (34)
Accrued cash flows 42 53
Total derivatives fair value 727 (146)
Hedged value of notes and debentures 3,280 3,278
GBP [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 796 435
GBP [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (115) (544)
EUR [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 3,449 4,486
Recognised in cash flow hedging reserve (16) (33)
Recognised in cost of hedging reserve 8 27
Recognised in the income statement (4) 7
Accrued cash flows 45 49
Total derivatives fair value 730 (295)
Hedged value of notes and debentures 4,146 4,141
EUR [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 585 73
EUR [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 112 (418)
CAD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 575 626
Recognised in cash flow hedging reserve (8) (28)
Recognised in cost of hedging reserve 6 25
Recognised in the income statement (3) (2)
Accrued cash flows 1 (2)
Total derivatives fair value 168 114
Hedged value of notes and debentures 747 747
CAD [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 167 142
CAD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk $ 5 $ (21)