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Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) $ 12 $ (21) $ (12) $ (25)
Total deferred gains/(losses) 69 (27) (5) (94)
Net deferred gains/(losses) 81 (48) (17) (119)
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income (4) (59) (1) (108)
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 (1) (51) (1) (114)
Non-utility revenue        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income (3) (8) 0 6
Non-utility operating revenue        
Pre-tax gains/(losses) recognized in income        
Unrealized gain/(loss) on derivatives 3 7 3 4
Deferred Derivative Gains, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 5 (21) (17) (22)
Deferred Derivative Gains, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 7 0 5 (3)
Deferred Derivative Losses, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 44 22 (4) 20
Recoverable Energy Costs, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (34) (40) (9) (85)
Deferred Derivative Losses, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 59 (9) 8 (29)
CECONY        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 9 (17) (13) (22)
Total deferred gains/(losses) 64 (27) (3) (85)
Net deferred gains/(losses) 73 (44) (16) (107)
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 (17) (16) (19)
CECONY | Deferred Derivative Gains, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 3 0 3 (3)
CECONY | Deferred Derivative Losses, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 42 20 (2) 21
CECONY | Recoverable Energy Costs, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (34) (39) (8) (78)
CECONY | Deferred Derivative Losses, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) $ 56 $ (8) $ 7 $ (28)