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Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($)
Investment Holdings [Line Items] |
Energy supply and hedging activities credit exposure total | $ 643
Makeup of net credit exposure independent system operators | 100
Makeup of net credit exposure non-investment grade/non-rated counterparties | 49
Makeup of net credit exposure with commodity exchange brokers | 194
Makeup of net credit exposure with investment-grade counterparties | 300
CECONY | Subsidiaries |
Investment Holdings [Line Items] |
Energy supply and hedging activities credit exposure total | 387
Makeup of net credit exposure non-investment grade/non-rated counterparties | 1
Makeup of net credit exposure with commodity exchange brokers | 157
Makeup of net credit exposure with investment-grade counterparties | $ 229

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