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Benefit Obligations (Schedule of Pension Benefits Expected to be Paid from the Plans or From the Company's Assets) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 235 [1]
2019 233 [1]
2020 231 [1]
2021 227 [1]
2022 224 [1]
2023-2027 1,090 [1]
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 5 [2]
2019 5 [2]
2020 4 [2]
2021 4 [2]
2022 4 [2]
2023-2027 $ 18 [2]
[1] Payments are expected to be made primarily from plan assets.
[2] Payments are expected to be made primarily from Company assets.