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Employee Retirement Plans - Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future employer benefit plan contribution $ 63
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2018 120
2019 125
2020 137
2021 134
2022 141
2023 - 2027 634
Postretirement Benefits  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2018 9
2019 9
2020 8
2021 8
2022 8
2023 - 2027 $ 42