Exit Activities and Asset Sales (Narrative) (Details) $ in Millions	1 Months Ended
	Sep. 30, 2025 USD ($) facility
Restructuring Cost and Reserve [Line Items]
Facilities agreed to sell | facility	13
Duration of purchase agreement	30 years
Required filing, period post signing	60 days
Minimum
Restructuring Cost and Reserve [Line Items]
Expected duration of review	12 months
Maximum
Restructuring Cost and Reserve [Line Items]
Expected duration of review	18 months
Retention Benefits | D.E. Karn Generating Complex and J.H. Campbell Generating Units | Retention Incentive Program
Restructuring Cost and Reserve [Line Items]
Regulatory asset collection period	3 years
Retention Benefits | J.H. Campbell Generating Units
Restructuring Cost and Reserve [Line Items]
Expected cost	$ 48
Retention Benefits | J.H. Campbell Generating Units | Retention Incentive Program
Restructuring Cost and Reserve [Line Items]
Cumulative deferred costs	$ 47