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Employee Benefits, Restructuring and Post-retirement Employee Benefits Provisions - Summary of Reconciliation of Employee Benefits, Restructuring and Post-retirement Employee Benefits (Detail)
$ in Millions
 12 Months Ended
Jun. 30, 2021
USD ($)
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [line items]  
At the beginning of the financial year $ 1,894
Charge/(credit) for the year:  
Underlying 1,509
Discounting 31
Net interest expense (10)
Exchange variations 135
Released during the year (128)
Remeasurement gains taken to retained earnings (58)
Utilisation (1,204)
Transfers and other movements 43
At the end of the financial year 2,212
Employee benefits [member]  
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [line items]  
At the beginning of the financial year 1,313
Charge/(credit) for the year:  
Underlying 1,402
Exchange variations 104
Released during the year (82)
Utilisation (1,119)
Transfers and other movements 6
At the end of the financial year 1,624
Restructuring [member]  
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [line items]  
At the beginning of the financial year 34
Charge/(credit) for the year:  
Underlying 45
Exchange variations 1
Utilisation (26)
At the end of the financial year 54
Post-retirement employee benefits [member]  
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [line items]  
At the beginning of the financial year 547
Charge/(credit) for the year:  
Underlying 62
Discounting 31
Net interest expense (10)
Exchange variations 30
Released during the year (46)
Remeasurement gains taken to retained earnings (58)
Utilisation (59)
Transfers and other movements 37
At the end of the financial year $ 534