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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, 2019
USD ($)
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [line items]  
At the beginning of the financial year $ 1,689
Charge/(credit) for the year:  
Underlying 1,226
Discounting 42
Net interest expense (21)
Exchange variations (54)
Released during the year (157)
Remeasurement gains taken to retained earnings 20
Utilisation (1,034)
At the end of the financial year 1,711
Employee benefits [member]  
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [line items]  
At the beginning of the financial year 1,232
Charge/(credit) for the year:  
Underlying 1,011
Exchange variations (49)
Released during the year (146)
Utilisation (908)
At the end of the financial year 1,140
Restructuring [member]  
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [line items]  
At the beginning of the financial year 8
Charge/(credit) for the year:  
Underlying 160
Exchange variations 1
Released during the year (11)
Utilisation (80)
At the end of the financial year 78
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 449
Charge/(credit) for the year:  
Underlying 55
Discounting 42
Net interest expense (21)
Exchange variations (6)
Remeasurement gains taken to retained earnings 20
Utilisation (46)
At the end of the financial year $ 493