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Income Tax Expense - Summary of Factors Affecting Income Tax Expense (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income tax expense benefits [Line Items]      
Australian prima facie tax rate 30.00% 30.00% 30.00%
US tax reform [Member]      
Income tax expense benefits [Line Items]      
Repatriation tax $ 797    
Previously unrecognised tax credits $ 603