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Income Tax Expense - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2017
AUD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
AUD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2018
AUD ($)
Jun. 30, 2018
USD ($)
May 31, 2017
AUD ($)
May 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
May 31, 2016
AUD ($)
May 31, 2016
USD ($)
Apr. 30, 2014
AUD ($)
Apr. 30, 2014
USD ($)
Income tax expense benefits [Line Items]                          
Assessed tax amount   $ 3,609       $ 3,503              
Tax and other matters [member] | Transfer pricing [member]                          
Income tax expense benefits [Line Items]                          
Assessed tax amount     $ 143           $ 105 $ 537 $ 396 $ 362 $ 267
Payments for assessments $ 52 $ 39 $ 276 $ 221                  
Tax and other matters [member] | Controlled foreign companies [member]                          
Income tax expense benefits [Line Items]                          
Assessed tax amount         $ 43 $ 32 $ 39 $ 29