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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities $ 20,983 $ 27,048  
Cash and cash equivalents 15,246 13,426 $ 15,613
USD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 11,146 14,625  
Cash and cash equivalents 12,003 9,555  
EUR [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 4,505 7,323  
Cash and cash equivalents 4 4  
GBP [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 3,415 3,272  
Cash and cash equivalents 32 519  
AUD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 1,053 1,055  
Cash and cash equivalents 573 1,011  
CAD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 635 597  
Cash and cash equivalents 2,455 2,131  
Other [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 229 176  
Cash and cash equivalents $ 179 $ 206