Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Current	$ 113	$ 118
Long-term	290	250
Total	403	368
Total Casualty
Loss Contingencies [Line Items]
Current	38	44
Long-term	150	136
Total	188	180
Personal Injury
Loss Contingencies [Line Items]
Current	31	37
Long-term	95	81
Total	126	118
Occupational
Loss Contingencies [Line Items]
Current	7	7
Long-term	55	55
Total	62	62
Environmental
Loss Contingencies [Line Items]
Current	40	37
Long-term	93	71
Total	133	108
Other
Loss Contingencies [Line Items]
Current	35	37
Long-term	47	43
Total	$ 82	$ 80