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Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Regulatory Assets [Line Items]    
Regulatory assets not earning return $ 2,452 $ 2,402
Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 2,299 2,240
Environmental investigation and remediation costs    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 1,022 1,037
Environmental investigation and remediation costs | Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 935 942
Revenue taxes    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 612 567
Revenue taxes | Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 586 543
UB deferral for uncollectible accounts receivable    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 541 551
UB deferral for uncollectible accounts receivable | Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 536 541
Deferred derivative losses - short term    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 116 102
Deferred derivative losses - short term | Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 108 92
Deferred derivative losses - long term    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 64 106
Deferred derivative losses - long term | Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 57 94
Unrecognized pension and other postretirement costs    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 21 0
Unrecognized pension and other postretirement costs | Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 13 0
Other    
Regulatory Assets [Line Items]    
Regulatory assets not earning return 76 39
Other | Subsidiaries | CECONY    
Regulatory Assets [Line Items]    
Regulatory assets not earning return $ 64 $ 28