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Net Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure of net debt [Line Items]    
Cash and cash equivalents restricted by legal or contractual arrangements $ 98,000,000 $ 180,000,000
Defaults on loans payable 0  
Revolving credit facility [Member]    
Disclosure of net debt [Line Items]    
Revolving credit facility, maximum amount 6,000,000,000  
Revolving credit facility, amount drawn
Revolving credit facility, maturity period P5Y