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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | TOTAL ASSETS | TOTAL ASSETS
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  | Liabilities, Current | Liabilities, Current
Derivative liabilities transferred from Level 3 to Level 2 |  | $ 0 |
Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Term of contract (in years) | 3 years | 3 years |
Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Term of contract (in years) |  | 3 years | 3 years
CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities transferred from Level 3 to Level 2 |  | $ 0 |
Level 3 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | (6,000,000) |
Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities transferred from Level 3 to Level 2 |  |  | $ 4,000,000
Derivative assets transferred out of level 3 |  | 10,000,000 |
Commodity | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities transferred from Level 3 to Level 2 |  |  | 3,000,000
Derivative assets transferred out of level 3 |  | 9,000,000 | 1,000,000
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 874,000,000 | 832,000,000
Derivative liabilities |  | 90,000,000 | 236,000,000
Recurring | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 663,000,000 | 728,000,000
Recurring | Netting Adjustment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | (418,000,000) | (171,000,000)
Derivative liabilities |  | (182,000,000) | (148,000,000)
Recurring | Netting Adjustment | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | (388,000,000) | (79,000,000)
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 527,000,000 | 587,000,000
Derivative liabilities |  | 26,000,000 | 33,000,000
Recurring | Level 1 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 505,000,000 | 541,000,000
Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 732,000,000 | 399,000,000
Derivative liabilities |  | 228,000,000 | 323,000,000
Recurring | Level 2 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 544,000,000 | 265,000,000
Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 33,000,000 | 17,000,000
Derivative liabilities |  | 18,000,000 | 28,000,000
Recurring | Level 3 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 2,000,000 | 1,000,000
Recurring | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 142,000,000 | 201,000,000
Derivative liabilities |  | 54,000,000 | 179,000,000
Recurring | Commodity | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 131,000,000 | 127,000,000
Derivative liabilities |  | 44,000,000 | 128,000,000
Recurring | Commodity | Netting Adjustment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | (420,000,000) | (171,000,000)
Derivative liabilities |  | (184,000,000) | (148,000,000)
Recurring | Commodity | Netting Adjustment | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | (388,000,000) | (79,000,000)
Derivative liabilities |  | (180,000,000) | (53,000,000)
Recurring | Commodity | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 84,000,000 | 95,000,000
Derivative liabilities |  | 18,000,000 | 33,000,000
Recurring | Commodity | Level 1 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 83,000,000 | 67,000,000
Derivative liabilities |  | 18,000,000 | 1,000,000
Recurring | Commodity | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 476,000,000 | 260,000,000
Derivative liabilities |  | 204,000,000 | 266,000,000
Recurring | Commodity | Level 2 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 434,000,000 | 138,000,000
Derivative liabilities |  | 198,000,000 | 172,000,000
Recurring | Commodity | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 2,000,000 | 17,000,000
Derivative liabilities |  | 16,000,000 | 28,000,000
Recurring | Commodity | Level 3 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 2,000,000 | 1,000,000
Derivative liabilities |  | 8,000,000 | 8,000,000
Recurring | Commodity held for sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 73,000,000 |
Derivative liabilities |  | 36,000,000 |
Recurring | Commodity held for sale | Netting Adjustment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 2,000,000 |
Derivative liabilities |  | 2,000,000 |
Recurring | Commodity held for sale | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 6,000,000 |
Derivative liabilities |  | 8,000,000 |
Recurring | Commodity held for sale | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 34,000,000 |
Derivative liabilities |  | 24,000,000 |
Recurring | Commodity held for sale | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 31,000,000 |
Derivative liabilities |  | 2,000,000 |
Recurring | Interest Rate Swaps |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 106,000,000 | 4,000,000
Derivative liabilities |  |  | 57,000,000
Recurring | Interest Rate Swaps | Netting Adjustment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 0 | 0
Recurring | Interest Rate Swaps | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 0 | 0
Recurring | Interest Rate Swaps | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 106,000,000 | 4,000,000
Derivative liabilities |  |  | 57,000,000
Recurring | Interest Rate Swaps | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 0 | 0
Recurring | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 553,000,000 | 627,000,000
Recurring | Other | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 532,000,000 | 601,000,000
Recurring | Other | Netting Adjustment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Recurring | Other | Netting Adjustment | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Recurring | Other | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 437,000,000 | 492,000,000
Recurring | Other | Level 1 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 422,000,000 | 474,000,000
Recurring | Other | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 116,000,000 | 135,000,000
Recurring | Other | Level 2 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 110,000,000 | 127,000,000
Recurring | Other | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Recurring | Other | Level 3 | CECONY |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 0 | $ 0

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