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Other Postretirement Benefits - Schedule of Expected Benefit Payments (Details) - Other Postretirement Benefits
$ in Millions
Dec. 31, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 67
2026 68
2027 70
2028 71
2029 71
2030-2034 346
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2025 59
2026 60
2027 61
2028 62
2029 63
2030-2034 $ 303