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Employee Benefit Plans - Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Maturity [Abstract] (Deprecated 2017-01-31)  
2018 $ 239
2019 239
2020 246
2021 251
2022 250
2024 - 2028 1,263
Total 2,488
Other Postretirement Benefits  
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Maturity [Abstract] (Deprecated 2017-01-31)  
2018 27
2019 24
2020 22
2021 20
2022 18
2024 - 2028 67
Total $ 178