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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | $ 783,000,000 | $ 723,000,000
Liabilities transferred out of Level 3 | 4,000,000 |
Assets transferred out of level 3 |  | 0
CECONY |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets transferred out of level 3 |  | 0
CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 753,000,000 | 699,000,000
Liabilities transferred out of Level 3 | 4,000,000 |
Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (27,000,000) | (54,000,000)
Netting Adjustment | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (28,000,000) | (52,000,000)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 527,000,000 | 511,000,000
Level 1 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 509,000,000 | 494,000,000
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 281,000,000 | 264,000,000
Level 2 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 271,000,000 | 256,000,000
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 2,000,000 | 2,000,000
Level 3 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 1,000,000 | 1,000,000
Commodity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 135,000,000 | 100,000,000
Derivative liabilities: | 207,000,000 | 314,000,000
Liabilities transferred out of Level 3 |  | 9,000,000
Commodity | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 128,000,000 | 98,000,000
Derivative liabilities: | 188,000,000 | 287,000,000
Liabilities transferred out of Level 3 |  | 6,000,000
Commodity | Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (27,000,000) | (54,000,000)
Derivative liabilities: | (44,000,000) | (65,000,000)
Commodity | Netting Adjustment | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (28,000,000) | (52,000,000)
Derivative liabilities: | (47,000,000) | (65,000,000)
Commodity | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 4,000,000 | 6,000,000
Derivative liabilities: | 20,000,000 | 22,000,000
Commodity | Level 1 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 4,000,000 | 6,000,000
Derivative liabilities: | 18,000,000 | 20,000,000
Commodity | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 156,000,000 | 146,000,000
Derivative liabilities: | 229,000,000 | 347,000,000
Commodity | Level 2 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 151,000,000 | 143,000,000
Derivative liabilities: | 216,000,000 | 326,000,000
Commodity | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 2,000,000 | 2,000,000
Derivative liabilities: | 2,000,000 | 10,000,000
Commodity | Level 3 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 1,000,000 | 1,000,000
Derivative liabilities: | 1,000,000 | 6,000,000
Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 523,000,000 | 505,000,000
Mutual Funds | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 505,000,000 | 488,000,000
Mutual Funds | Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Mutual Funds | Netting Adjustment | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Mutual Funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 523,000,000 | 505,000,000
Mutual Funds | Level 1 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 505,000,000 | 488,000,000
Mutual Funds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Mutual Funds | Level 2 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Mutual Funds | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Mutual Funds | Level 3 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 125,000,000 | 118,000,000
Other | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 120,000,000 | 113,000,000
Other | Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Other | Netting Adjustment | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Other | Level 1 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 125,000,000 | 118,000,000
Other | Level 2 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 120,000,000 | 113,000,000
Other | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Other | Level 3 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | $ 0 | $ 0

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