Commitments and Contingencies Personal Injury (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loss Contingency Accrual [Roll Forward]
Beginning balance	$ 120
Ending balance	120	$ 120
Personal Injury
Loss Contingency Accrual [Roll Forward]
Beginning balance	264	263	$ 296
Accruals / changes in estimates	103	89	51
Payments	(102)	(88)	(84)
Ending balance	265	264	263
Current portion of ending balance	85	$ 85	$ 90
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	$ 335