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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, 2018
USD ($)
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [Line Items]  
At the beginning of the financial year $ 1,625
Charge/(credit) for the year:  
Underlying 1,101
Discounting 34
Net interest expense (15)
Exchange variations (24)
Released during the year (32)
Remeasurement gains taken to retained earnings (1)
Utilisation (999)
At the end of the financial year 1,689
Employee benefits [member]  
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [Line Items]  
At the beginning of the financial year 1,177
Charge/(credit) for the year:  
Underlying 1,073
Exchange variations (29)
Released during the year (31)
Utilisation (958)
At the end of the financial year 1,232
Restructuring [member]  
Disclosure of employee benefits restructuring and post retirement employee benefits provisions [Line Items]  
At the beginning of the financial year 10
Charge/(credit) for the year:  
Underlying 6
Released during the year (1)
Utilisation (7)
At the end of the financial year 8
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 438
Charge/(credit) for the year:  
Underlying 22
Discounting 34
Net interest expense (15)
Exchange variations 5
Remeasurement gains taken to retained earnings (1)
Utilisation (34)
At the end of the financial year $ 449