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Other Postretirement Benefits - Schedule of Expected Benefit Payments (Details) - Other Postretirement Benefits
$ in Millions
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 68
2024 72
2026 73
2027 73
2028 73
2029-2033 353
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2024 60
2024 63
2026 64
2027 64
2028 64
2029-2033 $ 308