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Benefit Plans (Estimated Future Minimum Benefit Payments to Participants) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 178
2021 176
2022 180
2023 178
2024 178
2025-2029 841
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 1
2021 1
2022 1
2023 1
2024 1
2025-2029 $ 2