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Retirement Benefits (Benefit Payments) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 18
2023 17
2024 16
2025 15
2026 14
2027 – 2031 57
Defined Benefit Plan, Funded Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 4
2023 3
2024 3
2025 2
2026 2
2027 – 2031 11
Defined Benefit Plan, Unfunded Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 4
2023 4
2024 3
2025 3
2026 2
2027 – 2031 $ 7