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Benefit Plans (Estimated Future Minimum Benefit Payments to Participants) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 183
2019 175
2020 176
2021 175
2022 177
2023-2027 871
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 2
2019 2
2020 2
2021 1
2022 1
2023-2027 $ 2