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Income Tax Expense - Additional Information (Detail)
$ in Millions, $ in Millions
Nov. 19, 2018
USD ($)
Nov. 19, 2018
AUD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
AUD ($)
Jun. 30, 2018
USD ($)
Disclosure of significant subsidiaries [line items]          
Assessed tax amount     $ 3,443   $ 3,503
Tax and other matters [member] | Controlled foreign companies [member]          
Disclosure of significant subsidiaries [line items]          
Assessed tax amount     87 $ 125  
Tax and other matters [member] | Controlled foreign companies [member] | Litigated [member]          
Disclosure of significant subsidiaries [line items]          
Assessed tax amount     $ 30 $ 43  
Tax and other matters [member] | Transfer pricing [member]          
Disclosure of significant subsidiaries [line items]          
Payments for assessments $ 388 $ 529      
Tax and other matters [member] | Transfer pricing [member] | Prior years [member]          
Disclosure of significant subsidiaries [line items]          
Payments for assessments 243 328      
Tax and other matters [member] | Transfer pricing [member] | Current period [member]          
Disclosure of significant subsidiaries [line items]          
Payments for assessments $ 145 $ 201