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Intangible Assets and Goodwill - Estimated Future Amortization Expense on Finite-Lived Intangible Assets (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2020 $ 79
2021 79
2022 73
2023 51
2024 49
Thereafter 146
Total $ 477