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Net Finance Costs - Summary of Net Finance Costs (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of finance income costs [abstract]      
Interest capitalised 4.24% 3.25% 2.61%
Tax relief for capitalised interest $ 42 $ 34 $ 37