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Retirement Benefits (Schedule of Estimated Future Benefit Payments for Pension and Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
United States | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 264
2020 277
2021 291
2022 299
2023 306
2024-2028 1,626
United States | Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 4
2020 4
2021 4
2022 3
2023 3
2024-2028 12
Foreign Plan | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2019 272
2020 282
2021 291
2022 302
2023 320
2024-2028 1,768
Foreign Plan | Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 3
2020 3
2021 3
2022 3
2023 3
2024-2028 $ 15