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Retirement Benefits (Schedule of Estimated Future Benefit Payments for Pension and Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Domestic Plan | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 254
2019 268
2020 285
2021 294
2022 303
2023-2027 1,642
Domestic Plan | Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 4
2019 4
2020 4
2021 4
2022 3
2023-2027 14
Foreign Plan | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 279
2019 297
2020 305
2021 316
2022 326
2023-2027 1,837
Foreign Plan | Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 3
2019 4
2020 4
2021 3
2022 3
2023-2027 $ 17