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Retirement Benefits (Schedule of Estimated Future Benefit Payments for Pension and Postretirement Benefits) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
U.S. | Pension  Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 291
2022 302
2023 315
2024 321
2025 327
2026-2030 1,701
U.S. | Post-retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 4
2022 3
2023 3
2024 3
2025 3
2026-2030 10
Non-U.S. | Pension  Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 344
2022 353
2023 373
2024 382
2025 394
2026-2030 2,160
Non-U.S. | Post-retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 3
2022 3
2023 3
2024 3
2025 3
2026-2030 $ 15