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Capitalization - Common Stock (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2019 | Nov. 30, 2018 | Dec. 31, 2016
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 500,000,000 |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 320,960,396 | 332,629,597 | 320,960,396 |  |  |  |
Treasury shares (in shares) |  |  |  |  | 23,210,700 |  |  |  |  |
Shares issued (in shares) |  |  | 5,649,369 |  |  |  |  |  |  |
Value of shares issued |  |  | $ 425 |  | $ 825 | $ 705 | $ 343 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 321,000,000 | 333,000,000 | 321,000,000 | 310,000,000 |  |  | 305,000,000
Treasury shares (in shares) |  |  |  | 23,210,700 |  | 23,210,700 |  |  |  |
Shares issued (in shares) |  |  |  | 9,324,123 | 12,000,000 | 11,000,000 | 5,000,000 |  |  |
Value of shares issued |  |  |  | $ 705 | $ 1 |  | $ 1 |  |  |
Forward Contract |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares subject to forward sale agreements (in shares) |  |  |  |  | 1,050,000 |  |  | 5,800,000 | 14,973,492 |
Forward Contract | Common Stock |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 4,750,000 |  |  |  |  |  |  |  |
Value of shares issued |  | $ 400 |  |  |  |  |  |  |  |
CECONY |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 340,000,000 |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 235,488,094 |  |  |  |  |
Treasury shares (in shares) |  |  |  |  | 21,976,200 |  |  |  |  |
CECONY | Common Stock |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 235,488,094 | 235,000,000 | 235,488,094 | 235,000,000 |  |  | 235,000,000
Subsequent Event | Forward Contract | Common Stock |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 1,050,000 |  |  |  |  |  |  |  |  |
Value of shares issued | $ 88 |  |  |  |  |  |  |  |  |

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