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Income Taxes - Reconciliation to Effective Tax Rate (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
U.S. federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
(Decrease) increase due to: |  |  |  |
State income taxes, net of federal income tax benefit | 4.80% | 4.30% | 1.10% | 4.10%
Qualified NDT fund income and losses | 8.20% | (2.60%) | 6.60% | 4.70%
Amortization of ITC, including deferred taxes on basis differences | (0.30%) | (0.50%) | (0.20%) | (0.50%)
PTCs and other credits | (8.10%) | (0.60%) | (8.10%) | (0.60%)
Noncontrolling interests | 0.10% | 0.70% | 0.10% | 0.30%
Other | 1.60% | 0.60% | 0.50% | 0.40%
Effective income tax rate | 27.30% | 22.90% | 21.00% | 29.40%

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