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Stock-Based Compensation - Summary of Changes in Status of Performance RSUs' (Details) - Performance RSUs
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Units  
Non-vested at beginning of period (in shares) | shares 1,087,137
Granted (in shares) | shares 368,150
Vested (in shares) | shares (375,684)
Forfeited (in shares) | shares (50,671)
Transferred (in shares) | shares 0
Non-vested at end of period (in shares) | shares 1,028,932
CECONY  
Units  
Non-vested at beginning of period (in shares) | shares 848,342
Granted (in shares) | shares 277,318
Vested (in shares) | shares (293,842)
Forfeited (in shares) | shares (46,226)
Transferred (in shares) | shares (1,426)
Non-vested at end of period (in shares) | shares 784,166
TSR Portion  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) $ 55.45
Granted (in dollars per share) 73.13
Vested (in dollars per share) 25.36
Forfeited (in dollars per share) 76.29
Transferred (in dollars per share) 0.00
Non-vested at end of period (in dollars per share) $ 71.74
Adjustment percentage used for Performance awards 50.00%
TSR Portion | CECONY  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) $ 54.92
Granted (in dollars per share) 72.78
Vested (in dollars per share) 25.32
Forfeited (in dollars per share) 76.41
Transferred (in dollars per share) 53.01
Non-vested at end of period (in dollars per share) 71.06
Non-TSR Portion  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) 63.03
Granted (in dollars per share) 74.54
Vested (in dollars per share) 53.66
Forfeited (in dollars per share) 72.23
Transferred (in dollars per share) 0.00
Non-vested at end of period (in dollars per share) $ 70.11
Adjustment percentage used for Performance awards 50.00%
Non-TSR Portion | CECONY  
Weighted Average Grant Date Fair Value  
Non-vested at beginning of period (in dollars per share) $ 63.00
Granted (in dollars per share) 74.72
Vested (in dollars per share) 53.66
Forfeited (in dollars per share) 72.31
Transferred (in dollars per share) 72.52
Non-vested at end of period (in dollars per share) $ 70.08