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Intangible Assets - Additional Information (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Estimated amortization charged to income, remaining fourth quarter of 2018 $ 169
Estimated amortization charged to income, 2019 680
Estimated amortization charged to income, 2020 648
Estimated amortization charged to income, 2021 617
Estimated amortization charged to income, 2022 609
Estimated amortization charged to income, 2023 $ 594