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REVENUE - Disaggregation of Revenue - Schedule of Revenue from External Customers by Geographic Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue $ 3,189 $ 3,182 $ 6,319 $ 6,279
United States        
Disaggregation of Revenue [Line Items]        
Total revenue 2,963 2,959 5,883 5,840
Canada        
Disaggregation of Revenue [Line Items]        
Total revenue 140 137 273 272
Mexico        
Disaggregation of Revenue [Line Items]        
Total revenue 86 86 163 167
FMS        
Disaggregation of Revenue [Line Items]        
Total revenue 1,467 1,478 2,914 2,933
SCS        
Disaggregation of Revenue [Line Items]        
Total revenue 1,366 1,341 2,697 2,643
Operating Segments | FMS        
Disaggregation of Revenue [Line Items]        
Total revenue 1,467 1,478 2,914 2,933
Operating Segments | FMS | United States        
Disaggregation of Revenue [Line Items]        
Total revenue 1,391 1,400 2,766 2,780
Operating Segments | FMS | Canada        
Disaggregation of Revenue [Line Items]        
Total revenue 76 78 148 153
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 1,366 1,341 2,697 2,643
Operating Segments | SCS | United States        
Disaggregation of Revenue [Line Items]        
Total revenue 1,205 1,185 2,387 2,335
Operating Segments | SCS | Canada        
Disaggregation of Revenue [Line Items]        
Total revenue 75 70 147 141
Operating Segments | SCS | Mexico        
Disaggregation of Revenue [Line Items]        
Total revenue 86 86 163 167
Operating Segments | DTS        
Disaggregation of Revenue [Line Items]        
Total revenue 606 635 1,208 1,198
Operating Segments | DTS | United States        
Disaggregation of Revenue [Line Items]        
Total revenue 606 635 1,208 1,198
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 (250) (272) (500) (495)
Eliminations | United States        
Disaggregation of Revenue [Line Items]        
Total revenue (239) (261) (478) (473)
Eliminations | Canada        
Disaggregation of Revenue [Line Items]        
Total revenue (11) (11) (22) (22)
Eliminations | Mexico        
Disaggregation of Revenue [Line Items]        
Total revenue $ 0 $ 0 $ 0 $ 0