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Summary of Significant Accounting Policies and Other Matters - Changes in Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | $ 18,441 | $ 18,467 | $ 18,213 | $ 17,865 | $ 17,501 | $ 16,839 | $ 18,213 | $ 16,839
Beginning Balance |  |  | 18,022 |  |  |  | 18,022 |
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 2 | 0 | 5 | 1 | 1 | 4 | 7 | 6
Ending Balance | 18,711 | 18,441 | 18,467 | 18,134 | 17,865 | 17,501 | 18,711 | 18,134
Ending Balance | 18,494 |  |  |  |  |  | 18,494 |
Accumulated OCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | (14) | (14) | (19) | (11) | (12) | (16) | (19) | (16)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 2 |  | 5 | 1 | 1 | 4 |  |
Ending Balance | (12) | (14) | (14) | (10) | (11) | (12) | (12) | (10)
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 |  |  |  |  |  |  | 4 | 2
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of for Con Edison | 2 |  |  | 1 |  |  | 3 | 4
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 2 |  |  | 1 |  |  | 7 | 6
OCI before reclassifications, tax |  |  |  |  |  |  | (1) | (1)
CECONY |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | 14,265 | 14,333 | 14,147 | 13,868 | 13,319 | 12,910 | 14,147 | 12,910
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 0 | 1 | 1 | 1 | 0 | 0 | 2 | 1
Ending Balance | 14,575 | 14,265 | 14,333 | 14,079 | 13,868 | 13,319 | 14,575 | 14,079
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) |  |  | (1) |  |  | (2) | (1)
CECONY | Accumulated OCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | (4) | (5) | (6) | (5) | (5) | (5) | (6) | (5)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 0 | 1 | 1 | 1 |  |  |  |
Ending Balance | (4) | $ (4) | $ (5) | (4) | $ (5) | $ (5) | (4) | (4)
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 |  |  | 2 | 1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | $ 0 |  |  | $ 1 |  |  | $ 2 | $ 1

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