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Capitalization - Common Stock (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) dealer $ / shares shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($)
Schedule of Capitalization [Line Items] |  |  |
Common stock, shares authorized (in shares) | 500,000,000 |  |
Common stock, shares outstanding (in shares) | 345,415,772 | 354,962,058 |
Treasury shares (in shares) | 33,753,963 | 23,210,700 |
Number of dealers | dealer | 2 |  |
Stock repurchase program, authorized amount | $ | $ 1 |  |
Preferred stock, par or stated value per share (in usd per share) | $ / shares | $ 0.10 |  |
Repurchase of common shares | $ | $ 1,000 | $ 0 | $ 0
Treasury stock, shares, acquired | 10,543,263 |  |
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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