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v3.22.1

Summary of Significant Accounting Policies and Other Matters - Changes in Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | $ 20,336 | $ 19,065
Beginning Balance | 20,037 |
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 0 | 4
Ending Balance | 20,623 | 19,282
Ending Balance | 20,378 |
Subsidiaries |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 16,312 | 14,849
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 1 |
Ending Balance | 16,618 | 15,192
Accumulated OCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 5 | (25)
Ending Balance | 5 | (21)
Pension Plan LIabilities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
OCI before reclassifications, net of tax | (1) | 2
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax | 1 | 2
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 0 | 4
OCI before reclassifications, tax | 1 | (1)
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax |  | (1)
Accumulated OCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 5 | (25)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES |  | 4
Ending Balance | 5 | (21)
Accumulated OCI | Subsidiaries |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 0 | (7)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 1 |
Ending Balance | 1 | (7)
Pension Plan Liabilities | Subsidiaries |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax | 1 | 0
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES | 1 | 0
CECONY | Subsidiaries |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Ending Balance | 16,618 |
CECONY | Pension Plan Liabilities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
OCI before reclassifications, net of tax | $ 0 | $ 0

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