Casualty, Environmental and Other Reserves - Balance Sheet Presentation (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contingencies [Line Items]
Current	$ 144	$ 118
Long-term	292	250
Total	436	368	$ 314	$ 305
Casualty
Contingencies [Line Items]
Current	50	44
Long-term	144	136
Total	194	180	196	187
Personal Injury
Contingencies [Line Items]
Current	40	37
Long-term	86	81
Total	126	118
Occupational
Contingencies [Line Items]
Current	10	7
Long-term	58	55
Total	68	62
Environmental
Contingencies [Line Items]
Current	53	37
Long-term	108	71
Total	161	108	76	74
Other
Contingencies [Line Items]
Current	41	37
Long-term	40	43
Total	$ 81	$ 80	$ 42	$ 44