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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($)
Dec. 31, 2018
Jun. 30, 2018
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption   $ (31,000,000)  
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] | Minimum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, right-of-use asset $ 30,000,000    
Operating lease, liability 30,000,000    
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] | Maximum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, right-of-use asset 50,000,000    
Operating lease, liability $ 50,000,000    
Accounting standards update 2014-09 | Retained Earnings [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ 7,000,000
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     31,000,000
Accounting standards update 2016-16 | Retained Earnings [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     59,000,000
Accounting standards update 2016-16 | Non-controlling Interest [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ 25,000,000