Benefit Plans and Other Postretirement Benefits - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) benefitPlan	Dec. 31, 2024 USD ($)
Benefit Plans and Other Postretirement Benefits
Number of qualified pension plans | benefitPlan	2
Pension Benefits
Benefit Plans and Other Postretirement Benefits
Expects to contribute to the pension plans	$ 32
Actuarial gain (loss)	$ (28)	$ 35