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Other Postretirement Employee Benefit Plans (Benefit Payments That Reflect Expected Future Service) (Details) - Other postretirement benefits
$ in Millions
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 15
2022 14
2023 13
2024 12
2025 11
2026 - 2030 $ 47