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Environmental Matters - Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Site Contingency [Line Items] |  |
Regulatory assets | $ 4,987 | $ 4,370
Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 8 | 8
Regulatory assets | 8 | 8
Workers' Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 78 | 79
Regulatory assets | 3 | 5
CECONY |  |
Site Contingency [Line Items] |  |
Regulatory assets | 4,600 | 3,987
CECONY | Asbestos Suits |  |
Site Contingency [Line Items] |  |
Accrued liability | 7 | 7
Regulatory assets | 7 | 7
CECONY | Workers' Compensation |  |
Site Contingency [Line Items] |  |
Accrued liability | 73 | 75
Regulatory assets | $ 3 | $ 5

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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