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Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Level 3 Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 9 $ (9) $ (11) $ (19)
Included in earnings (10) 21 13 20
Included in regulatory assets and liabilities 14 (17) 7 (9)
Purchases 1 0 3 0
Settlements 2 0 3 3
Transfer out of level 3     (1) 0
Ending balance 16 (5) 16 (5)
CECONY | Subsidiaries        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (11) (7) (7) (10)
Included in earnings (1) 1 (3) (2)
Included in regulatory assets and liabilities 11 (11) 5 (7)
Purchases 0 0 0 0
Settlements 1 0 4 2
Transfer out of level 3     (1) 0
Ending balance $ 0 $ (17) $ 0 $ (17)