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Income Tax - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Taxes Disclosure [Line Items] |  |  |  |
Income tax expense | $ 119.0 | $ 116.0 | $ 183.0 | $ 243.0
Income tax benefit due to ability to carryback a NOL under the CARES Act |  |  | $ 4.0 |
Unprotected excess deferred federal income taxes amortization period |  |  | 5 years |
Estimated liability for uncertain tax positions | 14.0 |  | $ 14.0 |
Effective income tax rate reconciliation, uncertainty of taxes |  |  | 3.0 |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate | 14.0 |  | 14.0 |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate, net of federal taxes | 13.0 |  | 13.0 |
CECONY |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Income tax expense | 97.0 | $ 119.0 | 199.0 | $ 271.0
Estimated liability for uncertain tax positions | 4.0 |  | 4.0 |
Effective income tax rate reconciliation, uncertainty of taxes |  |  | 1.0 |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate | 4.0 |  | 4.0 |
Tax Year 2018 to 2013 |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Operating loss carryback |  |  | 29.0 |
Net tax refund | 2.5 |  | $ 2.5 |
Tax Year 2013 |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Discrete income tax benefit | $ 4.0 |  |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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