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Intangible Assets - Additional Information (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Estimated amortization charged to income, fourth quarter of 2019 $ 138
Estimated amortization charged to income, 2020 528
Estimated amortization charged to income, 2021 518
Estimated amortization charged to income, 2022 515
Estimated amortization charged to income, 2023 497
Estimated amortization charged to income, 2024 $ 477