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Capitalization - Common Stock (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Capitalization [Line Items] |  |  |
Common stock, shares authorized (in shares) |  | 500,000,000 |
Common stock, shares outstanding (in shares) |  | 353,983,712 | 342,297,534
Treasury shares (in shares) |  | 23,210,700 | 23,210,700
Shares issued (in shares) | 10,100,000 |  |
Proceeds from issuance of equity | $ 775 |  |
CECONY |  |  |
Schedule of Capitalization [Line Items] |  |  |
Common stock, shares authorized (in shares) |  | 340,000,000 |
Common stock, shares outstanding (in shares) |  | 235,488,094 | 235,488,094
Treasury shares (in shares) |  | 21,976,200 | 21,976,200

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