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Benefit Plans - Estimated Future Minimum Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments 2020 $ 234
Expected future benefit payments 2021 211
Expected future benefit payments 2022 215
Expected future benefit payments 2023 217
Expected future benefit payments 2024 212
Expected future benefit payments 2025 - 2029 1,001
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments 2020 5
Expected future benefit payments 2021 5
Expected future benefit payments 2022 4
Expected future benefit payments 2023 4
Expected future benefit payments 2024 3
Expected future benefit payments 2025 - 2029 $ 14