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Retirement Benefits and Trusteed Assets (Pension Plan - Benefits related to Qualified and Nonqualified Pension Plans Expected to be paid) (Details) - Pension plan
$ in Millions
Dec. 31, 2024
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2025 $ 321
2026 321
2027 323
2028 325
2029 321
2030-2034 1,585
Total $ 3,196