Commitments and Contingencies Personal Injury (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loss Contingency Accrual [Roll Forward]
Beginning balance	$ 120
Ending balance	125	$ 120
Personal Injury
Loss Contingency Accrual [Roll Forward]
Beginning balance	296	273	$ 275
Accruals / changes in estimates	51	61	45
Payments	(84)	(38)	(47)
Ending balance	263	296	273
Current portion of ending balance	90	$ 85	$ 75
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