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Retirement Benefits (Schedule of Estimated Future Benefit Payments for Pension and Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
U.S. Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 $ 244
2018 259
2019 276
2020 287
2021 297
2022-2026 1,641
Non-U.S. Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 240
2018 272
2019 281
2020 293
2021 303
2022-2026 1,719
U.S. Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 4
2018 4
2019 4
2020 4
2021 3
2022-2026 14
Non-U.S. Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 3
2018 3
2019 3
2020 3
2021 4
2022-2026 $ 19