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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue Recognition [Line Items]        
Royalty income   $ 165 $ 327 $ 314
Minimum [Member]        
Revenue Recognition [Line Items]        
Credit terms to customers   30 days    
Maximum [Member]        
Revenue Recognition [Line Items]        
Credit terms to customers   90 days    
United States [Member]        
Revenue Recognition [Line Items]        
Percentage sales reserves and allowances to U.S. customers 85.00%