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Commitments and Contingencies - Commitments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitment And Contingencies [Line Items]      
2019 $ 193,000,000    
2020 154,000,000    
2021 118,000,000    
2022 91,000,000    
2023 66,000,000    
2024 and thereafter 283,000,000    
Lease and rental expense 175,000,000 $ 200,000,000 $ 164,000,000
Royalty expense 536,000,000 $ 956,000,000 $ 814,000,000
Maximum [Member]      
Commitment And Contingencies [Line Items]      
Milestone contingent expense $ 420,000,000