Benefit Plans - Amounts Not Yet Recognized in Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Pension Benefits
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior service credit	$ 1	$ 1
Net actuarial loss	216	241
Net amount recognized	217	242
Other Postretirement Benefits
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior service credit	9
Net actuarial loss	(2)	2
Net amount recognized	$ 7	$ 2