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Net Debt - Summary of Interest Bearing Liabilities and Cash and Cash Equivalents Denominated by Currency (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities $ 27,048 $ 24,828  
Cash and cash equivalents 13,426 15,613 $ 15,871
USD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 14,625 12,485  
Cash and cash equivalents 9,555 9,214  
EUR [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 7,323 7,680  
Cash and cash equivalents 4 6  
GBP [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 3,272 3,118  
Cash and cash equivalents 519 48  
AUD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 1,055 951  
Cash and cash equivalents 1,011 3,023  
CAD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 597 594  
Cash and cash equivalents 2,131 3,092  
Other [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 176 0  
Cash and cash equivalents $ 206 $ 230