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Employee Benefits - Expected Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 233
2021 254
2022 267
2023 294
2024 306
2025-2029 1,811
Postretirement Welfare Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 7
2021 6
2022 6
2023 6
2024 5
2025-2029 19
Medicare Part D Subsidy [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 1
2021 1
2022 1
2023 1
2024 1
2025-2029 $ 2