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New and Amended Accounting Standards and Interpretations - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jul. 01, 2018
Disclosure of initial application of standards or interpretations [line items]          
Financial assets $ 20,411 $ 20,411 $ 20,008    
Available for sale 1,390 1,390 1,199    
Cumulative cost of hedging 114 114 58 $ 153  
Impact of applying this change would have been to increased/(reduce) revenue   (44,288) (43,129) (35,740)  
Impact of applying this change would have been to increased/(reduce) expenses   28,022 27,527 24,120  
Impact on profit after tax   9,185 4,823 6,222  
IAS 39 [member] | Loans and receivables [member]          
Disclosure of initial application of standards or interpretations [line items]          
Financial assets     17,700    
IAS 39 [member] | Non-current investment in shares [member] | Available for sale securities [member]          
Disclosure of initial application of standards or interpretations [line items]          
Available for sale     33    
IAS 39 [member] | Non-current other investments [member] | Financial assets held at fair value through profit or loss [member]          
Disclosure of initial application of standards or interpretations [line items]          
Available for sale     47    
IFRS 9 [member] | Financial assets held at amortised cost [member]          
Disclosure of initial application of standards or interpretations [line items]          
Financial assets         $ 17,700
IFRS 9 [member] | Non-current investment in shares [member] | Financial assets held at fair value through other comprehensive income [member]          
Disclosure of initial application of standards or interpretations [line items]          
Available for sale         33
IFRS 9 [member] | Non-current other investments [member] | Financial assets held at fair value through profit or loss [member]          
Disclosure of initial application of standards or interpretations [line items]          
Available for sale         47
Impact of adopting IFRS 9 [member]          
Disclosure of initial application of standards or interpretations [line items]          
Expected credit loss provision (7) (7)     (7)
Cumulative cost of hedging         $ 176
Increase (decrease) due to application of IFRS 15 [member]          
Disclosure of initial application of standards or interpretations [line items]          
Impact of applying this change would have been to increased/(reduce) revenue   522 509 395  
Impact of applying this change would have been to increased/(reduce) expenses   522 509 395  
Impact on profit after tax   $ 0 $ 0 $ 0  
Impact on the basic and diluted earnings per ordinary share   $ 0 $ 0 $ 0  
Increase (decrease) due to application of IFRS 16 [member]          
Disclosure of initial application of standards or interpretations [line items]          
Increase in lease liabilities 2,300 $ 2,300      
Increase in right of use assets 2,200 $ 2,200      
Net adjustments to other assets and liabilities $ 100        
Weighted average incremental borrowing rate 2.10% 2.10%