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Employee Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 4
2021 6
2022 6
2023 6
2024 7
2025 - 2029 39
Post Employment Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2020 10
2021 10
2022 10
2023 10
2024 9
2025 - 2029 $ 49