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Income Tax - Schedule of Income Tax Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
STATUTORY TAX RATE |  |  |
Federal | 21.00% | 21.00% | 21.00%
Changes in computed taxes resulting from: |  |  |
State income taxes, net of federal income tax benefit | 4.00% | 4.00% | 4.00%
Taxes attributable to noncontrolling interests | (1.00%) | (1.00%) | 0.00%
Cost of removal | 2.00% | 1.00% | 1.00%
Other plant-related items | (1.00%) | (1.00%) | (1.00%)
TCJA deferred tax re-measurement | 0 | 0 | 0.02
Amortization of excess deferred federal income taxes | (14.00%) | (4.00%) | (3.00%)
Renewable energy credits | (3.00%) | (2.00%) | (1.00%)
Research and development credits | 0.00% | (1.00%) | 0.00%
Other | (1.00%) | 0.00% | 0.00%
Effective tax rate | 7.00% | 17.00% | 23.00%
CECONY |  |  |
STATUTORY TAX RATE |  |  |
Federal | 21.00% | 21.00% | 21.00%
Changes in computed taxes resulting from: |  |  |
State income taxes, net of federal income tax benefit | 5.00% | 5.00% | 5.00%
Taxes attributable to noncontrolling interests | 0.00% | 0.00% | 0.00%
Cost of removal | 1.00% | 1.00% | 1.00%
Other plant-related items | (1.00%) | (1.00%) | (1.00%)
TCJA deferred tax re-measurement | 0 | 0 | 0
Amortization of excess deferred federal income taxes | (12.00%) | (4.00%) | (3.00%)
Renewable energy credits | 0.00% | 0.00% | 0.00%
Research and development credits | 0.00% | (1.00%) | (1.00%)
Other | 1.00% | 0.00% | (1.00%)
Effective tax rate | 15.00% | 21.00% | 21.00%

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