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Pension and Other Postretirement Benefits (Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Retiree Medicare drug subsidy  
2018 $ (5)
2019 (5)
2020 (5)
2021 (5)
2022 (5)
2023-2027 (22)
Pension benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 448
2019 266
2020 263
2021 261
2022 258
2023-2027 1,229
Expected contribution in the next fiscal year 53
Postretirement benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 54
2019 52
2020 49
2021 46
2022 43
2023-2027 172
Expected contribution in the next fiscal year $ 49