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Fair Value Measurements - Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ (11) $ (19)
Included in earnings (11) (9)
Included in regulatory assets and liabilities 11 3
Purchases 0 6
Settlements 11 5
Changes in level 3 assets and liabilities held for sale 25 0
Transfer out of level 3 (10) 3
Ending Balance 15 (11)
CECONY    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (7) (10)
Included in earnings (5) (3)
Included in regulatory assets and liabilities 10 1
Purchases 0 0
Settlements 5 3
Changes in level 3 assets and liabilities held for sale 0 0
Transfer out of level 3 (9) 2
Ending Balance $ (6) $ (7)