Casualty, Environmental and Other Reserves - Balance Sheet Presentation (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Contingencies [Line Items]
Current	$ 144	$ 144
Long-term	296	292
Total	440	436	$ 368	$ 314
Casualty
Contingencies [Line Items]
Current	52	50
Long-term	143	144
Total	195	194	180	196
Personal Injury
Contingencies [Line Items]
Current	45	40
Long-term	83	86
Total	128	126
Occupational
Contingencies [Line Items]
Current	7	10
Long-term	60	58
Total	67	68
Environmental
Contingencies [Line Items]
Current	41	53
Long-term	113	108
Total	154	161	108	76
Other
Contingencies [Line Items]
Current	51	41
Long-term	40	40
Total	$ 91	$ 81	$ 80	$ 42