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v3.20.4

Summary of Significant Accounting Policies and Other Matters - Changes in Accumulated Other Comprehensive Income/(Loss) by Component (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
BALANCE AS OF BEGINNING OF PERIOD | $ 18,213 | $ 16,839 | $ 15,425
BALANCE AS OF BEGINNING OF PERIOD | 18,022 |  |
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES | (6) | (3) | 10
BALANCE AS OF END OF PERIOD | 18,847 | 18,022 |
BALANCE AS OF END OF PERIOD | 19,065 | 18,213 | 16,839
Accumulated OCI |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
BALANCE AS OF BEGINNING OF PERIOD | (19) | (16) | (26)
BALANCE AS OF END OF PERIOD | (25) | (19) | (16)
Pension Plan Liabilities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
OCI before reclassifications, net of tax | (11) | (10) | 4
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax | 5 | 7 | 6
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES | (6) | (3) | 10
OCI before reclassifications, tax | 4 | (6) | 3
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax | (2) | (2) | (2)
Accumulated OCI |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
BALANCE AS OF BEGINNING OF PERIOD | (19) | (16) | (26)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES | (6) | (3) | 10
BALANCE AS OF END OF PERIOD | (25) | (19) | (16)
CECONY |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
BALANCE AS OF BEGINNING OF PERIOD | 14,147 | 12,910 | 12,439
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES | (1) | (1) | 1
BALANCE AS OF END OF PERIOD | 14,849 | 14,147 | 12,910
CECONY | Accumulated OCI |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
BALANCE AS OF BEGINNING OF PERIOD | (6) | (5) | (6)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES | (1) | (1) | 1
BALANCE AS OF END OF PERIOD | (7) | (6) | (5)
CECONY | Pension Plan Liabilities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
OCI before reclassifications, net of tax | (3) | (3) | 0
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax | 2 | 2 | 1
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES | (1) | (1) | $ 1
OCI before reclassifications, tax | $ 1 | $ (1) |

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