Public Utilities, Number Of Customers Affected

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- Definition

Public Utilities, Removal Costs

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Public Utilities, Service And Repair Costs

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Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Regulatory Liabilities, Income Tax Benefit

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Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Regulatory Liabilities, Income Tax Benefit, Subject To Normalization Requirements

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Amount of regulatory costs not yet approved by the regulatory authority.

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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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Amount of public utility's interim rate increase (decrease) allowed while waiting final decision of regulatory agency.

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Discloses the amount of construction work in process that is included in the rate making process at period end.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(b))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions		1 Months Ended	3 Months Ended
	Apr. 01, 2018 USD ($)	Mar. 31, 2018 USD ($) customer	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory assets		$ 4,407.0	$ 4,407.0		$ 4,333.0
CECONY
Public Utilities, General Disclosures [Line Items]
Regulatory assets		$ 3,986.0	3,986.0		$ 3,925.0
Impact in regulatory liability resulting from TCJA			112.0
CECONY \| Future Income Tax
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA			3,513.0
CECONY \| Accelerated Tax Depreciation Benefits
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA			2,542.0
CECONY \| Deferred Income Tax Charge, Amortized Over Remaining Life of Asset
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA			971.0
CECONY \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer		209
Restoration costs		$ 106.0
Operation and maintenance expenses		15.0
Operation and maintenance expenses charged against a storm reserve		56.0
Capital expenditures		29.0	29.0
Removal costs		$ 6.0
O&R \| Future Income Tax
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA			161.0
O&R \| Accelerated Tax Depreciation Benefits
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA			126.0
O&R \| Deferred Income Tax Charge, Amortized Over Remaining Life of Asset
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA			35.0
O&R \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer		93
Restoration costs		$ 31.0
RECO \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer		44
Restoration costs		$ 11.0
NYSPSC \| CECONY \| MTA Subway Power Outage
Public Utilities, General Disclosures [Line Items]
Regulatory costs		149.0	149.0
Regulatory assets		122.0	122.0
NYSPSC \| CECONY \| MTA Subway Power Outage \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Regulatory costs				$ 115.0
Regulatory assets				110.0
NYSPSC \| CECONY \| MTA Subway Power Outage \| Electric
Public Utilities, General Disclosures [Line Items]
Regulatory costs		27.0	$ 27.0
NYSPSC \| CECONY \| MTA Subway Power Outage \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Regulatory costs				$ 5.0
NJBPU \| RECO \| Electric \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Approved interim rate decrease	$ 2.9
FERC \| RECO
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA		28.0
Impact in regulatory liability resulting from TCJA, subject to normalization requirements		$ 16.0