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Retirement Benefits (Schedule of Estimated Future Benefit Payments for Pension and Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
U.S. | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 281
2021 293
2022 305
2023 312
2024 318
2025-2029 1,675
U.S. | Post-retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 4
2021 4
2022 3
2023 3
2024 3
2025-2029 11
Non-U.S. | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 322
2021 328
2022 338
2023 358
2024 368
2025-2029 2,019
Non-U.S. | Post-retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 3
2021 3
2022 3
2023 3
2024 3
2025-2029 $ 15