Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Current	$ 151	$ 144
Long-term	287	292
Total	438	436
Total Casualty
Loss Contingencies [Line Items]
Current	50	50
Long-term	143	144
Total	193	194
Personal Injury
Loss Contingencies [Line Items]
Current	40	40
Long-term	87	86
Total	127	126
Occupational
Loss Contingencies [Line Items]
Current	10	10
Long-term	56	58
Total	66	68
Environmental
Loss Contingencies [Line Items]
Current	53	53
Long-term	109	108
Total	162	161
Other
Loss Contingencies [Line Items]
Current	48	41
Long-term	35	40
Total	$ 83	$ 81