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Employee Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Sep. 30, 2020
USD ($)
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 96
2026 - 2030 1
Pension Benefits [Member] | Foreign Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 12
2022 10
2023 10
2024 12
2025 11
2026 - 2030 57
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 3
2022 3
2023 3
2024 2
2025 2
2026 - 2030 9
Postretirement Benefits [Member] | Foreign Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 1
2022 1
2023 1
2024 1
2025 1
2026 - 2030 $ 4