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Property Damage, Clean Up And Response Expense

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Public Utilities, Number Of Customers Affected

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Public Utilities, Removal Costs

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Public Utilities, Service And Repair Costs

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Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount awarded to other party in judgment or settlement of litigation.

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Amount of loss contingency liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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A noncash adjustment to the provision established for storm damage by an oil, gas, or utility company.

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Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation.

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Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions		1 Months Ended		9 Months Ended	12 Months Ended		36 Months Ended
	Jul. 13, 2019 USD ($) customer	Apr. 30, 2020 USD ($)	Mar. 31, 2018 customer	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018	Dec. 31, 2022 USD ($)	Mar. 31, 2020 USD ($)
CECONY \| NYSPSC \| Manhattan Steam Main Rupture
Public Utilities, General Disclosures [Line Items]
Property damage, clean up and response expense					$ 17
Capital and retirement costs					9
CECONY \| NYSPSC \| Steam
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA				$ 15	185
TCJA, net benefit amortization, allocation period				3 years
Tax credit, amortization period						3 years
CECONY \| Electric \| West Side of Manhattan
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer	72
Revenues	$ 5
CECONY \| Electric \| Brooklyn
Public Utilities, General Disclosures [Line Items]
Revenues	$ 10
CECONY \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer			209
Restoration costs					134
Operation and maintenance expenses					15
Operation and maintenance expenses charged against a storm reserve					84
Capital expenditures					29
Removal costs					6
CECONY \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA							$ 377
TCJA, net benefit amortization, allocation period							3 years
CECONY \| Electric \| Scenario, Forecast \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA							$ 1,663
CECONY \| Electric \| Scenario, Forecast \| Unprotected Portion
Public Utilities, General Disclosures [Line Items]
TCJA, net benefit amortization, allocation period							5 years
Impact in regulatory liability resulting from TCJA							$ 784
CECONY \| Gas \| NYSPSC \| Violations of Gas Operator Qualification, Performance and Inspection Requirements
Public Utilities, General Disclosures [Line Items]
Loss contingency accrual					10			$ 5
CECONY \| Gas \| NYSPSC \| Violations of Gas Operator Qualification, Performance and Inspection Requirements \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Settlement agreement, amount		$ 15
CECONY \| Gas \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA							$ 63
TCJA, net benefit amortization, allocation period							2 years
CECONY \| Gas \| Scenario, Forecast \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA							$ 725
CECONY \| Gas \| Scenario, Forecast \| Unprotected Portion
Public Utilities, General Disclosures [Line Items]
TCJA, net benefit amortization, allocation period							5 years
Impact in regulatory liability resulting from TCJA							$ 107
O&R \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer			93
Restoration costs					43
O&R \| Electric and Gas Transmission Projects \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA							$ 22
TCJA, net benefit amortization, allocation period							3 years
O&R \| Electric and Gas Transmission Projects \| Scenario, Forecast \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA							$ 123
O&R \| Electric and Gas Transmission Projects \| Scenario, Forecast \| Unprotected Portion
Public Utilities, General Disclosures [Line Items]
TCJA, net benefit amortization, allocation period							15 years
Impact in regulatory liability resulting from TCJA							$ 30
RECO \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer			44
Restoration costs					$ 17