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Summary of Significant Accounting Policies and Other Matters - Changes in Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended							9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 17,865	$ 17,501	$ 16,839	$ 15,898	$ 15,655	$ 15,661	$ 15,425	$ 16,839	$ 15,425
Beginning Balance			16,726					16,726
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	1	4	2	2	2	4	6	8
Ending Balance	18,134	17,865	17,501	16,839	15,898	15,655	15,661	18,134	15,898
Ending Balance	17,959			16,726				17,959
Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(11)	(12)	(16)	(18)	(20)	(22)	(26)	(16)	(26)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	1	4	2	2	2	4
Ending Balance	(10)	(11)	(12)	(16)	(18)	(20)	(22)	(10)	(18)
Pension Plan LIabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018								2	3
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	1				2			4	5
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1				2			6	8
Pension Plan Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, tax								(1)	(1)
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax	(1)				(1)			(1)	(2)
CECONY
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	13,868	13,319	12,910	12,869	12,625	12,662	12,439	12,910	12,439
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	0	0	0	0	1	0	1	1
Ending Balance	14,079	13,868	13,319	12,910	12,869	12,625	12,662	14,079	12,869
CECONY | Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5)	(5)	(5)	(5)	(5)	(6)	(6)	(5)	(6)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1					1
Ending Balance	(4)	$ (5)	$ (5)	$ (5)	(5)	$ (5)	$ (6)	(4)	(5)
CECONY | Pension Plan Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018								0	0
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	1				0			1	1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	$ 1				$ 0			$ 1	$ 1

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