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Intangible Assets and Goodwill - Estimated Future Amortization Expense on Finite-Lived Intangible Assets (Detail)
$ in Millions
Sep. 30, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2021 $ 81
2022 76
2023 52
2024 50
2025 40
Thereafter 108
Total $ 407