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Intangible Assets - Additional Information (Detail)
$ in Millions
Jun. 30, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Estimated amortization charged to income, remaining two quarters of 2019 $ 347
Estimated amortization charged to income, 2020 663
Estimated amortization charged to income, 2021 633
Estimated amortization charged to income, 2022 623
Estimated amortization charged to income, 2023 612
Estimated amortization charged to income, 2024 $ 569