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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year $ 675 $ 778
Additions 98 31
Amortisation for the year (118) (142)
Impairments for the year   (14)
Transfers and other movements (31) 22
At the end of the financial year 624 675
Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year 1,944  
At the end of the financial year 1,827 1,944
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year (1,269)  
At the end of the financial year (1,203) (1,269)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year 247 247
At the end of the financial year 247 247
Goodwill [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year 247  
At the end of the financial year 247 247
Other intangibles [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year 428 531
Additions 98 31
Amortisation for the year (118) (142)
Impairments for the year   (14)
Transfers and other movements (31) 22
At the end of the financial year 377 428
Other intangibles [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year 1,697  
At the end of the financial year 1,580 1,697
Other intangibles [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
At the beginning of the financial year (1,269)  
At the end of the financial year $ (1,203) $ (1,269)