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v3.21.1

Summary of Significant Accounting Policies and Other Matters - Changes in Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | $ 19,065 | $ 18,213
Beginning Balance | 18,847 |
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 4 | 5
Ending Balance | 19,282 | 18,467
Ending Balance | 19,033 |
Accumulated OCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (25) | (19)
Ending Balance | (21) | (14)
Pension Plan LIabilities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
OCI before reclassifications, net of tax of $(1) for Con Edison in 2020 and 2019 | 2 | 4
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of for Con Edison | 2 | 1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 4 | 5
OCI before reclassifications, tax |  | (1)
Accumulated OCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (25) | (19)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 4 | 5
Ending Balance | (21) | (14)
CECONY |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 14,849 | 14,147
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 0 | 1
Ending Balance | 15,192 | 14,333
CECONY | Pension Plan LIabilities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax |  | (1)
CECONY | Accumulated OCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (7) | (6)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES |  | 1
Ending Balance | (7) | (5)
CECONY | Pension Plan Liabilities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
OCI before reclassifications, net of tax of $(1) for Con Edison in 2020 and 2019 | 0 | 0
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of for Con Edison | 0 | 1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | $ 0 | $ 1

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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