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Pension and Other Postretirement Benefits (Schedule of Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 14
2019 14
2020 14
2021 13
2022 13
2023 - 2027 56
U.S. Plans | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 102
2019 107
2020 107
2021 98
2022 100
2023 - 2027 491
Non-U.S. Plans | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 161
2019 164
2020 167
2021 166
2022 168
2023 - 2027 $ 846