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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, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities $ 24,828 $ 26,805  
Cash and cash equivalents 15,613 15,871 $ 14,153
USD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 12,485 12,981  
Cash and cash equivalents 9,214 7,024  
EUR [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 7,680 9,070  
Cash and cash equivalents 6 5,845  
GBP [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 3,118 3,104  
Cash and cash equivalents 48 1,560  
AUD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 951 1,077  
Cash and cash equivalents 3,023 9  
CAD [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest bearing liabilities 594 573  
Cash and cash equivalents 3,092 1,301  
Other [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents $ 230 $ 132