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Employee Benefit Plans - Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Maturity [Abstract] (Deprecated 2017-01-31)  
2018 $ 221
2019 237
2020 240
2021 247
2022 247
2023 - 2027 1,253
Total 2,445
Other Postretirement Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Maturity [Abstract] (Deprecated 2017-01-31)  
2018 30
2019 27
2020 24
2021 22
2022 20
2023 - 2027 74
Total $ 197