Income Tax (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Income Tax Reconciliation

Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the nine months ended September 30, is as follows:

	Con Edison				CECONY
(% of Pre-tax income)	2018		2017		2018		2017
STATUTORY TAX RATE
Federal	21	%	35	%	21	%	35	%
Changes in computed taxes resulting from:
State income tax	5		4		5		4
Cost of removal	1		1		1		1
Other plant-related items	(1	)	(1	)	(1	)	(1	)
Renewable energy credits	(1	)	(1	)	—		—
TCJA deferred tax re-measurement	3		—		—		—
Amortization of excess deferred federal income taxes	(3	)	—		(3	)	—
Other	(1	)	(1	)	(1	)	(1	)
Effective tax rate	24	%	37	%	22	%	38	%

Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes for the three months ended September 30, is as follows:

	Con Edison				CECONY
(% of Pre-tax income)	2018		2017		2018		2017
STATUTORY TAX RATE
Federal	21	%	35	%	21	%	35	%
Changes in computed taxes resulting from:
State income tax	5		5		5		4
Other plant-related items	(1	)	(1	)	(1	)	(1	)
Renewable energy credits	(1	)	(1	)	—		—
TCJA deferred tax re-measurement	7		—		—		—
Amortization of excess deferred federal income taxes	(2	)	—		(2	)	—
Other	(1	)	(1	)	(1	)	—
Effective tax rate	28	%	37	%	22	%	38	%