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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, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | $ 671,000,000 | $ 874,000,000
Derivative liabilities: | 155,000,000 | 90,000,000
Assets transferred out of level 3 | 10,000,000 |
Liabilities transferred out of Level 3 |  | 0
CECONY |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities transferred out of Level 3 |  | 0
CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 645,000,000 | 663,000,000
Derivative liabilities: | 139,000,000 | 44,000,000
Assets transferred out of level 3 | 10,000,000 |
Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (75,000,000) | (418,000,000)
Derivative liabilities: | (72,000,000) | (182,000,000)
Netting Adjustment | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (73,000,000) | (388,000,000)
Derivative liabilities: | (73,000,000) | (180,000,000)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 483,000,000 | 527,000,000
Derivative liabilities: | 16,000,000 | 26,000,000
Level 1 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 471,000,000 | 505,000,000
Derivative liabilities: | 15,000,000 | 18,000,000
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 258,000,000 | 732,000,000
Derivative liabilities: | 196,000,000 | 228,000,000
Level 2 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 244,000,000 | 544,000,000
Derivative liabilities: | 187,000,000 | 198,000,000
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 5,000,000 | 33,000,000
Derivative liabilities: | 15,000,000 | 18,000,000
Level 3 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 3,000,000 | 2,000,000
Derivative liabilities: | 10,000,000 | 8,000,000
Commodity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 88,000,000 | 142,000,000
Derivative liabilities: | 155,000,000 | 54,000,000
Assets transferred out of level 3 |  | 10,000,000
Commodity | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 81,000,000 | 131,000,000
Derivative liabilities: | 139,000,000 | 44,000,000
Assets transferred out of level 3 |  | 9,000,000
Commodity | Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (75,000,000) | (420,000,000)
Derivative liabilities: | (72,000,000) | (184,000,000)
Commodity | Netting Adjustment | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | (73,000,000) | (388,000,000)
Derivative liabilities: | (73,000,000) | (180,000,000)
Commodity | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 21,000,000 | 84,000,000
Derivative liabilities: | 16,000,000 | 18,000,000
Commodity | Level 1 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 21,000,000 | 83,000,000
Derivative liabilities: | 15,000,000 | 18,000,000
Commodity | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 137,000,000 | 476,000,000
Derivative liabilities: | 196,000,000 | 204,000,000
Commodity | Level 2 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 130,000,000 | 434,000,000
Derivative liabilities: | 187,000,000 | 198,000,000
Commodity | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 5,000,000 | 2,000,000
Derivative liabilities: | 15,000,000 | 16,000,000
Commodity | Level 3 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 3,000,000 | 2,000,000
Derivative liabilities: | 10,000,000 | 8,000,000
Commodity held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 73,000,000
Derivative liabilities: | 0 | 36,000,000
Commodity held for sale | Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 2,000,000
Derivative liabilities: | 0 | 2,000,000
Commodity held for sale | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 6,000,000
Derivative liabilities: | 0 | 8,000,000
Commodity held for sale | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 34,000,000
Derivative liabilities: | 0 | 24,000,000
Commodity held for sale | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 31,000,000
Derivative liabilities: | 0 | 2,000,000
Interest rate swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 106,000,000
Interest rate swap | Netting Adjustment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Interest rate swap | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 0
Interest rate swap | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 0 | 106,000,000
Interest rate swap | Level 3 |  |
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: | 583,000,000 | 553,000,000
Other | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 564,000,000 | 532,000,000
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: | 462,000,000 | 437,000,000
Other | Level 1 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 450,000,000 | 422,000,000
Other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 121,000,000 | 116,000,000
Other | Level 2 | CECONY | Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 114,000,000 | 110,000,000
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

X
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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