REVENUE - Disaggregation of Revenue - Schedule of Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,171	$ 3,168	$ 9,490	$ 9,447
United States
Disaggregation of Revenue [Line Items]
Total revenue	2,945	2,954	8,830	8,797
Canada
Disaggregation of Revenue [Line Items]
Total revenue	138	133	411	403
Mexico
Disaggregation of Revenue [Line Items]
Total revenue	88	81	249	247
FMS
Disaggregation of Revenue [Line Items]
Total revenue	1,465	1,470	4,379	4,403
SCS
Disaggregation of Revenue [Line Items]
Total revenue	1,380	1,317	4,077	3,960
Operating Segments | FMS
Disaggregation of Revenue [Line Items]
Total revenue	1,465	1,470	4,379	4,403
Operating Segments | FMS | United States
Disaggregation of Revenue [Line Items]
Total revenue	1,390	1,393	4,156	4,174
Operating Segments | FMS | Canada
Disaggregation of Revenue [Line Items]
Total revenue	75	77	223	229
Operating Segments | FMS | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Operating Segments | SCS
Disaggregation of Revenue [Line Items]
Total revenue	1,380	1,317	4,077	3,960
Operating Segments | SCS | United States
Disaggregation of Revenue [Line Items]
Total revenue	1,219	1,170	3,608	3,506
Operating Segments | SCS | Canada
Disaggregation of Revenue [Line Items]
Total revenue	73	66	220	207
Operating Segments | SCS | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	88	81	249	247
Operating Segments | DTS
Disaggregation of Revenue [Line Items]
Total revenue	570	633	1,778	1,831
Operating Segments | DTS | United States
Disaggregation of Revenue [Line Items]
Total revenue	570	633	1,778	1,831
Operating Segments | DTS | Canada
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Operating Segments | DTS | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Eliminations
Disaggregation of Revenue [Line Items]
Total revenue	(244)	(252)	(744)	(747)
Eliminations | United States
Disaggregation of Revenue [Line Items]
Total revenue	(234)	(242)	(712)	(714)
Eliminations | Canada
Disaggregation of Revenue [Line Items]
Total revenue	(10)	(10)	(32)	(33)
Eliminations | Mexico
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 0	$ 0	$ 0