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Capitalization - Common Stock (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Jan. 31, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2019 | Dec. 31, 2017
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 500,000,000 |  |  | 500,000,000 |  |  |  |
Common stock, shares outstanding (in shares) | 342,297,534 |  |  | 342,297,534 | 332,629,597 |  |  |
Treasury shares (in shares) | 23,210,700 |  |  | 23,210,700 | 23,210,700 |  |  |
Value of shares issued |  |  |  | $ 640 | $ 825 | $ 705 |  |
Proceeds from issuance of common stock |  |  |  | $ 640 | $ 825 | $ 705 |  |
0.65 Percent Debentures Due 2023 | Debentures |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |
Interest rate | 0.65% |  |  | 0.65% |  |  |  |
Proceeds from sale of aggregate principal amount | $ 650 |  |  |  |  |  |  |
Term Loan Due July 2020 | Term Loan |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 820 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 342,000,000 |  |  | 342,000,000 | 333,000,000 | 321,000,000 |  | 310,000,000
Shares issued (in shares) | 7,200,000 |  |  | 9,000,000 | 12,000,000 | 11,000,000 |  |
Value of shares issued |  |  |  | $ 1 | $ 1 |  |  |
Proceeds from issuance of common stock | $ 553 |  |  |  |  |  |  |
Forward Contract | Common Stock |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |
Common stock, shares subject to forward sale agreements (in shares) |  |  |  |  |  |  | 5,800,000 |
Shares issued (in shares) |  | 1,050,000 | 4,750,000 |  |  |  |  |
Value of shares issued |  | $ 88 | $ 400 |  |  |  |  |
CECONY |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 340,000,000 |  |  | 340,000,000 |  |  |  |
Common stock, shares outstanding (in shares) | 235,488,094 |  |  | 235,488,094 | 235,488,094 |  |  |
Treasury shares (in shares) | 21,976,200 |  |  | 21,976,200 | 21,976,200 |  |  |
CECONY | Common Stock |  |  |  |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 235,000,000 |  |  | 235,000,000 | 235,000,000 | 235,000,000 |  | 235,000,000

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