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Financial Risk Management - Summary of Hedging instruments (Detail) - Interest rate risk [member] - USD ($)
$ in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about hedging instruments [line items]    
Notional value $ 15,579 $ 16,800
Interest rate swap contract [member] | USD [member]    
Disclosure of detailed information about hedging instruments [line items]    
Notional value 10,719  
cross currency interest rate swaps [member] | EUR [member]    
Disclosure of detailed information about hedging instruments [line items]    
Notional value 3,187  
cross currency interest rate swaps [member] | GBP [member]    
Disclosure of detailed information about hedging instruments [line items]    
Notional value 1,673  
Not​ later​ than​ two​ years​ [member]    
Disclosure of detailed information about hedging instruments [line items]    
Notional value 2,075  
Not​ later​ than​ two​ years​ [member] | Interest rate swap contract [member] | USD [member]    
Disclosure of detailed information about hedging instruments [line items]    
Notional value 748  
Not​ later​ than​ two​ years​ [member] | cross currency interest rate swaps [member] | EUR [member]    
Disclosure of detailed information about hedging instruments [line items]    
Notional value 404  
Not​ later​ than​ two​ years​ [member] | cross currency interest rate swaps [member] | GBP [member]    
Disclosure of detailed information about hedging instruments [line items]    
Notional value $ 923