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Income Taxes - Reconciliation to Effective Tax Rate (Details)	3 Months Ended		9 Months Ended
	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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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