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Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) $ 6 $ (3) $ (6) $ (28)
Total deferred gains/(losses) 36 (63) 31 (155)
Net deferred gains/(losses) 42 (66) 25 (183)
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income (7) (42) (8) (150)
Purchased power expense        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
Gas purchased for resale        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 (47) (1) (161)
Non-utility revenue        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income (7) 5 (7) 11
Non-utility operating revenue        
Pre-tax gains/(losses) recognized in income        
Unrealized gain/(loss) on derivatives (4) 6 (6) 2
Deferred Derivative Gains, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 6 (4) (11) (26)
Deferred Derivative Gains, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 0 1 5 (2)
Deferred Derivative Losses, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 25 (11) 21 10
Recoverable Energy Costs, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (4) (40) (13) (125)
Deferred Derivative Losses, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 15 (12) 23 (40)
CECONY        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 8 (2) (6) (24)
Total deferred gains/(losses) 33 (55) 30 (141)
Net deferred gains/(losses) 41 (57) 24 (165)
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
CECONY | Purchased power expense        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
CECONY | Gas purchased for resale        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
CECONY | Non-utility revenue        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
CECONY | Deferred Derivative Gains, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 6 (3) (10) (22)
CECONY | Deferred Derivative Gains, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 2 1 4 (2)
CECONY | Deferred Derivative Losses, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 25 (9) 23 11
CECONY | Recoverable Energy Costs, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (6) (38) (14) (116)
CECONY | Deferred Derivative Losses, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) $ 14 $ (8) $ 21 $ (36)