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Employee Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 8
2022 6
2023 6
2024 6
2025 7
2026 - 2030 37
Post Employment Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2021 10
2022 10
2023 10
2024 10
2025 10
2026 - 2030 $ 52