REVENUE - Disaggregation of Revenue - Schedule of Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,131	$ 3,098
United States
Disaggregation of Revenue [Line Items]
Total revenue	2,922	2,883
Canada
Disaggregation of Revenue [Line Items]
Total revenue	133	135
Mexico
Disaggregation of Revenue [Line Items]
Total revenue	76	80
FMS
Disaggregation of Revenue [Line Items]
Total revenue	1,447	1,455
SCS
Disaggregation of Revenue [Line Items]
Total revenue	1,331	1,302
Operating Segments | FMS
Disaggregation of Revenue [Line Items]
Total revenue	1,447	1,455
Operating Segments | FMS | United States
Disaggregation of Revenue [Line Items]
Total revenue	1,375	1,380
Operating Segments | FMS | Canada
Disaggregation of Revenue [Line Items]
Total revenue	72	75
Operating Segments | FMS | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Operating Segments | SCS
Disaggregation of Revenue [Line Items]
Total revenue	1,331	1,302
Operating Segments | SCS | United States
Disaggregation of Revenue [Line Items]
Total revenue	1,183	1,151
Operating Segments | SCS | Canada
Disaggregation of Revenue [Line Items]
Total revenue	72	71
Operating Segments | SCS | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	76	80
Operating Segments | DTS
Disaggregation of Revenue [Line Items]
Total revenue	602	563
Operating Segments | DTS | United States
Disaggregation of Revenue [Line Items]
Total revenue	602	563
Operating Segments | DTS | Canada
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Operating Segments | DTS | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Eliminations
Disaggregation of Revenue [Line Items]
Total revenue	(249)	(222)
Eliminations | United States
Disaggregation of Revenue [Line Items]
Total revenue	(238)	(211)
Eliminations | Canada
Disaggregation of Revenue [Line Items]
Total revenue	(11)	(11)
Eliminations | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 0