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Intangible Assets - Amortization Expense Charged to Income for Intangible Assets (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization expense $ 79 $ 156 $ 292 $ 480