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Financial Instruments and Fair Value Measurements - Additional Information (Detail)
$ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
AUD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investment carrying value $ 164 $ 123 $ 164   $ 173 $ 136
Non-cash impairments of equity method investment   $ 13        
Notional value of fair value hedges       $ 100    
Cash Flow Hedging [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Notional value of foreign exchange contract derivatives designated for hedging 51   51      
Notional value of interest rate swap derivatives designated as cash flow hedges       700    
Amount recognized in earnings for ineffective portion of derivative instruments designated as cash flow hedges 1   1      
Estimates of net derivative gains related to cash flow hedges included in Accumulated other comprehensive loss 5   5      
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Notional value of interest rate swap derivatives designated as cash flow hedges       $ 400    
Estimates of net derivative gains related to cash flow hedges included in Accumulated other comprehensive loss 1   1      
Cash Flow Hedging [Member] | Interest Rate Swap [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Estimates of net derivative gains related to cash flow hedges included in Accumulated other comprehensive loss 3   3      
Fair Value Hedging [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Adjustments decreased the carrying value of long-term debt 2   2      
Not Designated as Hedging Instrument, Economic Hedge [Member] | Foreign Exchange Contract [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Notional value of cross currency interest rate swaps designated as cash flow hedges $ 75   $ 75