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Short-Term Borrowing (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Short-term Debt [Line Items] |  |
Commercial paper, outstanding | $ 1,488,000,000 | $ 1,705,000,000
Weighted average interest rate | 0.30% | 0.30%
Loans outstanding under credit agreement | $ 0 | $ 0
Maximum ratio of consolidated debt to consolidated total capital | 0.52 |
Minimum percentage of liens on assets | 5.00% |
Failure to pay, maximum aggregate limit | $ 150,000,000 |
Maximum |  |
Short-term Debt [Line Items] |  |
Maximum ratio of consolidated debt to consolidated total capital | 0.65 |
Revolving Credit |  |
Short-term Debt [Line Items] |  |
Maximum borrowing capacity | $ 1,500,000,000 |
Current amount available | 1,000,000,000 |
Letters of Credit |  |
Short-term Debt [Line Items] |  |
Maximum borrowing capacity | 1,200,000,000 |
CECONY |  |
Short-term Debt [Line Items] |  |
Commercial paper, outstanding | $ 1,361,000,000 | $ 1,660,000,000
Weighted average interest rate | 0.30% | 0.30%
Maximum ratio of consolidated debt to consolidated total capital | 0.55 |
Credit Availability Through December 2022 | CECONY | Revolving Credit |  |
Short-term Debt [Line Items] |  |
Maximum borrowing capacity | $ 2,250,000,000 |
Credit Availability Through December 2023 | CECONY | Revolving Credit |  |
Short-term Debt [Line Items] |  |
Maximum borrowing capacity | $ 2,200,000,000 |

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