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Income Tax - Income Tax Reconciliation (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
STATUTORY TAX RATE |  |  |  |
Federal | 21.00% | 21.00% | 21.00% | 21.00%
Changes in computed taxes resulting from: |  |  |  |
State income tax | 4.00% | 5.00% | 4.00% | 5.00%
Cost of removal |  |  | 1.00% | 1.00%
Other plant-related items | 0.00% | (1.00%) | 0.00% | (1.00%)
Renewable energy credits | (1.00%) | (1.00%) | (2.00%) | (1.00%)
TCJA deferred tax re-measurement | 0 | 0.07 | 0 | 0.03
Reserve for uncertain tax positions | 1.00% | 0.00% |  |
Amortization of excess deferred federal income taxes | (3.00%) | (2.00%) | (4.00%) | (3.00%)
Prior period return adjustments | (2.00%) | 0.00% |  |
Other | 0.00% | (1.00%) | (1.00%) | (1.00%)
Effective tax rate | 20.00% | 28.00% | 19.00% | 24.00%
CECONY |  |  |  |
STATUTORY TAX RATE |  |  |  |
Federal | 21.00% | 21.00% | 21.00% | 21.00%
Changes in computed taxes resulting from: |  |  |  |
State income tax | 5.00% | 5.00% | 5.00% | 5.00%
Cost of removal |  |  | 1.00% | 1.00%
Other plant-related items | 0.00% | (1.00%) | (1.00%) | (1.00%)
Renewable energy credits | 0.00% | 0.00% | 0.00% | 0.00%
TCJA deferred tax re-measurement | 0 | 0 | 0 | 0
Reserve for uncertain tax positions | 0.00% | 0.00% |  |
Amortization of excess deferred federal income taxes | (3.00%) | (2.00%) | (3.00%) | (3.00%)
Prior period return adjustments | 0.00% | 0.00% |  |
Other | (1.00%) | (1.00%) | (1.00%) | (1.00%)
Effective tax rate | 22.00% | 22.00% | 22.00% | 22.00%

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