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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Amortization expense $ 133 $ 160
Estimated amortization charged to income, remaining three quarters of 2020 237  
Estimated amortization charged to income, 2021 307  
Estimated amortization charged to income, 2022 298  
Estimated amortization charged to income, 2023 280  
Estimated amortization charged to income, 2024 259  
Estimated amortization charged to income, 2025 $ 254