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Retirement Benefits (Benefit Payments) (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 $ 16
2024 15
2025 15
2026 14
2027 13
2028 – 2032 55
Defined Benefit Plan, Funded Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 1
2024 1
2025 1
2026 1
2027 1
2028 – 2032 7
Defined Benefit Plan, Unfunded Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 4
2024 3
2025 3
2026 2
2027 2
2028 – 2032 $ 6