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Income Tax - Income Tax Reconciliation (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
STATUTORY TAX RATE |  |  |  |
Federal | 21.00% | 21.00% | 21.00% | 21.00%
Changes in computed taxes resulting from: |  |  |  |
State income tax, net of federal income tax benefit | 2.00% | 7.00% | 4.00% | 6.00%
Taxes attributable to non-controlling interest |  |  | 0.00% | 1.00%
Amortization of excess deferred federal income taxes | (17.00%) | (17.00%) | (5.00%) | (9.00%)
Cost of removal | 4.00% | 3.00% | 1.00% | 1.00%
Other plant-related items | (1.00%) | (1.00%) | 0.00% | (1.00%)
Renewable energy credits | (1.00%) | (4.00%) | 0.00% | (2.00%)
Allowance for uncollectible accounts, net of COVID-19 assistance | 0.00% | (2.00%) |  |
Injuries and damages reserve | 1.00% | 0.00% |  |
Reserve for uncertain tax positions | 0.00% | 2.00% | 0.00% | 1.00%
Remeasurement of deferred income taxes | 4.00% | 0.00% | 1.00% | 0.00%
Research and development credits | (1.00%) | (3.00%) | 0.00% | (1.00%)
Other | 0.00% | 0.00% |  |
Deferred unamortized ITC recognized on sale of subsidiary |  |  | (0.06) | 0
Gain on sale of subsidiary |  |  | (0.02) | 0
Effective tax rate | 12.00% | 6.00% | 14.00% | 17.00%
CECONY | Subsidiaries |  |  |  |
STATUTORY TAX RATE |  |  |  |
Federal | 21.00% | 21.00% | 21.00% | 21.00%
Changes in computed taxes resulting from: |  |  |  |
State income tax, net of federal income tax benefit | 5.00% | 5.00% | 5.00% | 5.00%
Taxes attributable to non-controlling interest |  |  | 0.00% | 0.00%
Amortization of excess deferred federal income taxes | (18.00%) | (27.00%) | (8.00%) | (12.00%)
Cost of removal | 4.00% | 4.00% | 2.00% | 2.00%
Other plant-related items | (1.00%) | (2.00%) | (1.00%) | (1.00%)
Renewable energy credits | 0.00% | 0.00% | 0.00% | 0.00%
Allowance for uncollectible accounts, net of COVID-19 assistance | 0.00% | (3.00%) |  |
Injuries and damages reserve | 1.00% | 1.00% |  |
Reserve for uncertain tax positions | 0.00% | 0.00% | 0.00% | 0.00%
Remeasurement of deferred income taxes | 4.00% | 0.00% | 1.00% | 0.00%
Research and development credits | (1.00%) | (4.00%) | (1.00%) | (1.00%)
Other | 0.00% | (1.00%) |  |
Deferred unamortized ITC recognized on sale of subsidiary |  |  | 0 | 0
Gain on sale of subsidiary |  |  | 0 | 0
Effective tax rate | 15.00% | (6.00%) | 19.00% | 14.00%

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