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Retirement Benefits - Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Postretirement Health Care Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 7
2023 6
2024 6
2025 6
2026 5
2027-2031 23
UNITED STATES | Pension Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2022 161
2023 178
2024 197
2025 217
2026 240
2027-2031 1,370
Non U.S. | Pension Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2022 53
2023 54
2024 56
2025 57
2026 58
2027-2031 $ 310