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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, 2021
Jun. 30, 2020
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures $ 14,769 $ 21,045
Recognised in cash flow hedging reserve (142) (71)
Recognised in cost of hedging reserve 77 32
Recognised in the income statement (18) 72
Accrued cash flows 177 151
Total derivatives fair value (557) (433)
Hedged value of notes and debentures 14,118 20,428
Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 650 1,463
Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (1,301) (2,080)
USD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 6,270 9,926
Recognised in the income statement 11 29
Accrued cash flows 77 74
Total derivatives fair value (230) (639)
Hedged value of notes and debentures 5,952 9,184
USD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (318) (742)
GBP [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 3,387 3,245
Recognised in cash flow hedging reserve (81) (16)
Recognised in cost of hedging reserve 25 13
Recognised in the income statement (34) (18)
Accrued cash flows 53 47
Total derivatives fair value (146) 60
Hedged value of notes and debentures 3,278 3,279
GBP [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 435 764
GBP [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (544) (730)
EUR [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 4,486 7,294
Recognised in cash flow hedging reserve (33) (55)
Recognised in cost of hedging reserve 27 21
Recognised in the income statement 7 65
Accrued cash flows 49 32
Total derivatives fair value (295) (13)
Hedged value of notes and debentures 4,141 7,218
EUR [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 73 500
EUR [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (418) (576)
CAD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 626 580
Recognised in cash flow hedging reserve (28)  
Recognised in cost of hedging reserve 25 (2)
Recognised in the income statement (2) (4)
Accrued cash flows (2) (2)
Total derivatives fair value 114 159
Hedged value of notes and debentures 747 747
CAD [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 142 199
CAD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk $ (21) $ (32)