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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, 2023
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2024 $ 319
2025 328
2026 322
2027 321
2028 324
2029-2033 1,605
Total $ 3,219