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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
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ (10) $ 5 $ 1 $ 6
Included in earnings 7 (4) 8 (1)
Included in regulatory assets and liabilities (13) (5) (21) (11)
Purchases     1 2
Sales 0 4 0 4
Settlements (4) 1 (9) 1
Ending balance (20) 1 (20) 1
CECONY        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (6) 2 1 8
Included in earnings 1 0 1 (1)
Included in regulatory assets and liabilities (8) (3) (14) (6)
Purchases     1 1
Sales 0 0 0 0
Settlements (1) 1 (3) (2)
Ending balance $ (14) $ 0 $ (14) $ 0