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Pension Benefits - Schedule of Expected Benefit Payments (Details) - Pension Benefits
$ in Millions
Dec. 31, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 840
2026 808
2027 820
2028 824
2029 836
2030-2034 4,227
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2025 781
2026 749
2027 764
2028 766
2029 778
2030-2034 $ 3,952