Acquisitions - Post-Acquisition Operating Results (Details) - USD ($) $ in Millions	3 Months Ended	8 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2025
Franklin Mountain Energy
Business Combination [Line Items]
Revenue	$ 204	$ 588
Net income	118	$ 263
Avant
Business Combination [Line Items]
Revenue	77		$ 195
Net income	$ 26		$ 56