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Capitalization - Additional Information (Details)	1 Months Ended		3 Months Ended
Capitalization - Additional Information (Details)	Jun. 30, 2021 USD ($) shares	May 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Feb. 28, 2021 USD ($) project
Schedule of Capitalization [Line Items]
Issuance of common shares – public offering (shares) \| shares	10,100,000
Proceeds from issuance of equity	$ 775,000,000
Borrowings Due 2028 \| Clean Energy Businesses
Schedule of Capitalization [Line Items]
Face amount of debt						$ 250,000,000
Number of solar electric production projects \| project						4
Interest rate						3.39%
Tax Equity Financing Agreement \| Clean Energy Businesses
Schedule of Capitalization [Line Items]
Number of solar electric production projects \| project						3
Amount funded from tax equity financing agreement			$ 263,000,000
2.40 percent maturing in 2031 \| CECONY \| Subsidiaries
Schedule of Capitalization [Line Items]
Face amount of debt			$ 750,000,000
Interest rate			2.40%
3.60 percent maturing in 2061 \| CECONY \| Subsidiaries
Schedule of Capitalization [Line Items]
Face amount of debt			$ 750,000,000
Interest rate			3.60%
2.00% Debentures Due 2021
Schedule of Capitalization [Line Items]
Interest rate		2.00%
Repayments of debt		$ 500,000,000
Debt instrument term		5 years
Floating Debentures \| CECONY \| Subsidiaries
Schedule of Capitalization [Line Items]
Repayments of debt	$ 640,000,000
Debt instrument term	3 years
Floating Rate Notes Due 2024 \| Clean Energy Businesses
Schedule of Capitalization [Line Items]
Long-term debt			$ 37,000,000
2.31% Debenture Due 2031
Schedule of Capitalization [Line Items]
Face amount of debt			$ 45,000,000
Interest rate			231.00%
3.17% Debenture Due 2051
Schedule of Capitalization [Line Items]
Face amount of debt			$ 30,000,000
Interest rate			317.00%
Senior Notes \| 3.77% Senior Notes Due 2046 \| Clean Energy Businesses \| Subsidiaries
Schedule of Capitalization [Line Items]
Face amount of debt	$ 229,000,000			$ 229,000,000	$ 3.77
Repayments of debt				$ 675,000,000
Senior Notes \| 4.45% 10 Year Debentures \| Clean Energy Businesses
Schedule of Capitalization [Line Items]
Interest rate			4.52%
Long-term debt			$ 104,000,000