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Deferred Tax Balances - Summary of Composition of Unrecognised Deferred Tax Assets and Liabilities (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Income and capital tax losses with a tax benefit, which are not recognised as deferred tax assets $ 2,405 $ 2,265
Tax credits, which are not recognised as deferred tax assets 1,683 $ 1,455
Gross amount of income tax losses not recognised 8,559  
Gross amount of tax losses not recognised 12,709  
Due not later than one year [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of income tax losses not recognised 474  
Later than one year and not later than two years [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of income tax losses not recognised 240  
Later than two years and not later than five years [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of income tax losses not recognised 2,525  
Later than five years and not later than 10 years [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of income tax losses not recognised 679  
Later than 10 years and not later than 20 years [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax credits, which are not recognised as deferred tax assets 46  
Gross amount of income tax losses not recognised 2,379  
Unlimited [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of income tax losses not recognised 2,262  
Gross amount of capital tax losses 4,150  
Not Later than 10 year[member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax credits, which are not recognised as deferred tax assets $ 1,637