This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(10))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Variable Interest Entities - Additional Information (Details)		12 Months Ended
	Mar. 01, 2023 USD ($) solarProject	Dec. 31, 2022	Mar. 31, 2023 USD ($) project	Jun. 30, 2021 USD ($)
Variable Interest Entity [Line Items]
Number of solar projects	2		2
Clean Energy Businesses
Variable Interest Entity [Line Items]
Equity method investments	$ 20,000,000		$ 0	$ 11,000,000
Variable Interest Entity, Primary Beneficiary \| Con Edison Development \| CED Nevada Virginia \| Clean Energy Businesses
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)		100.00%
Variable Interest Entity, Primary Beneficiary \| Con Edison Development \| Tax Equity Projects \| Clean Energy Businesses
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)	0.00%	100.00%