Benefit Plans - Actuarial Assumptions and Year-End Asset Allocations (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension and Supplemental Executive Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Discount Rate Used to Determine Benefit Obligation(in hundredths)	5.50%	5.70%	5.20%
Cash Balance Interest Crediting Rate Used to Determine Benefit Obligation (in hundredths)	4.84%	4.78%
Discount Rate Used to Determine Net Periodic Benefit Cost (in hundredths)	5.70%	5.20%
Expected Long-term Return on Plan Assets Used to Determine Net Periodic Benefit Cost (in hundredths)	6.00%	6.00%
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate Used to Determine Benefit Obligation(in hundredths)	5.30%	5.65%
Discount Rate Used to Determine Net Periodic Benefit Cost (in hundredths)	5.65%	5.20%
Expected Long-term Return on Plan Assets Used to Determine Net Periodic Benefit Cost (in hundredths)	7.50%	7.50%
Weighted-average asset allocations of plans (in hundredths)	100.00%	100.00%
Other Postretirement Benefit Plan | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of plans (in hundredths)	100.00%	100.00%
Other Postretirement Benefit Plan | Total fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of plans (in hundredths)	0.00%	0.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of plans (in hundredths)	100.00%	100.00%
Pension Plan | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of plans (in hundredths)	21.00%	21.00%
Pension Plan | Total fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations of plans (in hundredths)	79.00%	79.00%