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Retirement Benefits (Benefit Payments) (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 14
2026 13
2027 12
2028 12
2029 11
2030 – 2034 46
Defined Benefit Plan, Funded Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 72
2026 4
2027 4
2028 4
2029 5
2030 – 2034 26
Defined Benefit Plan, Unfunded Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 3
2026 2
2027 2
2028 2
2029 1
2030 – 2034 $ 5