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Intangible Assets - Additional Information (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Estimated amortization charged to income, fourth quarter of 2017 $ 170
Estimated amortization charged to income, 2018 687
Estimated amortization charged to income, 2019 675
Estimated amortization charged to income, 2020 628
Estimated amortization charged to income, 2021 603
Estimated amortization charged to income, 2022 $ 592