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Employee Benefits - Expected Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 250
2022 266
2023 292
2024 312
2025 362
2026-2030 1,880
Postretirement Welfare Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 5
2022 4
2023 4
2024 4
2025 3
2026-2030 $ 12