Commitments and Contingencies Personal Injury (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Loss Contingency Accrual [Roll Forward]
Beginning balance	$ 120
Ending balance	115	$ 120
Personal Injury
Loss Contingency Accrual [Roll Forward]
Beginning balance	265	264	$ 263
Accruals / changes in estimates	74	103	89
Payments	(73)	(102)	(88)
Ending balance	266	265	264
Current portion of ending balance	80	$ 85	$ 85
Personal Injury | Minimum
Loss Contingency Accrual [Roll Forward]
Future costs to settle claims and associated liability	220
Personal Injury | Maximum
Loss Contingency Accrual [Roll Forward]
Future costs to settle claims and associated liability	$ 340