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Pension Benefits - Schedule of Expected Benefit Payments (Details) - Pension Benefits
$ in Millions
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 768
2024 817
2026 789
2027 804
2028 811
2029-2033 4,158
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2024 711
2024 762
2026 734
2027 750
2028 756
2029-2033 $ 3,891