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Employee Benefit Plans (Expected Benefit Payments) (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected benefit payments, 2020 $ 70
Defined benefit plan, expected benefit payments, 2021 37
Defined benefit plan, expected benefit payments, 2022 48
Defined benefit plan, expected benefit payments, 2023 46
Defined benefit plan, expected benefit payments, 2024 46
Defined benefit plan, expected benefit payments, 2025-2029 210
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected benefit payments, 2020 13
Defined benefit plan, expected benefit payments, 2021 13
Defined benefit plan, expected benefit payments, 2022 13
Defined benefit plan, expected benefit payments, 2023 13
Defined benefit plan, expected benefit payments, 2024 13
Defined benefit plan, expected benefit payments, 2025-2029 $ 69