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Intangible Assets - Additional Information (Detail)
$ in Millions
Jun. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Estimated amortization charged to income, remaining two quarters of 2018 $ 346
Estimated amortization charged to income, 2019 682
Estimated amortization charged to income, 2020 648
Estimated amortization charged to income, 2021 617
Estimated amortization charged to income, 2022 610
Estimated amortization charged to income, 2023 $ 600