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SEGMENT INFORMATION - Summary of Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Total sales $ 2,886 $ 2,663 $ 8,202 $ 7,804  
Cost of sales (1,884) (1,783) (5,362) (5,235)  
Gross profit 1,002 880 2,840 2,569  
Selling, general & administrative expenses (375) (318) (1,029) (915)  
Engineering expenses (59) (50) (155) (155)  
Amortization expense (77) (79) (219) (224)  
Income from operations 491 433 1,437 1,275  
Interest expense and other, net (66) (55) (136) (149)  
Income before income taxes 425 378 1,301 1,126  
Depreciation and amortization 128 134 365 375  
Capital expenditures 55 46 138 123  
Segment assets 21,527 18,644 21,527 18,644 $ 18,702
Intersegment eliminations          
Segment Reporting Information [Line Items]          
Total sales (27) (35) (72) (81)  
Corporate Activities and Elimination          
Segment Reporting Information [Line Items]          
Total sales 0 0 0 0  
Cost of sales 0 0 0 0  
Gross profit 0 0 0 0  
Selling, general & administrative expenses (38) (36) (126) (109)  
Engineering expenses 0 0 0 0  
Amortization expense 0 0 0 0  
Income from operations (38) (36) (126) (109)  
Interest expense and other, net (66) (55) (136) (149)  
Income before income taxes (104) (91) (262) (258)  
Depreciation and amortization 4 5 11 13  
Capital expenditures 5 2 10 4  
Segment assets 1,602 1,283 1,602 1,283  
Freight Segment          
Segment Reporting Information [Line Items]          
Total sales 2,093 1,930 5,913 5,674  
Freight Segment | Operating Segments          
Segment Reporting Information [Line Items]          
Total sales 2,093 1,930 5,913 5,674  
Cost of sales (1,343) (1,257) (3,781) (3,707)  
Gross profit $ 750 $ 673 $ 2,132 $ 1,967  
Gross margin 35.80% 35.00% 36.10% 34.70%  
Selling, general & administrative expenses $ (219) $ (173) $ (564) $ (488)  
Engineering expenses (45) (37) (119) (123)  
Amortization expense (72) (73) (200) (207)  
Income from operations 414 390 1,249 1,149  
Interest expense and other, net 0 0 0 0  
Income before income taxes 414 390 1,249 1,149  
Depreciation and amortization 107 111 299 312  
Capital expenditures 36 32 92 82  
Segment assets 15,471 13,259 15,471 13,259  
Freight Segment | Intersegment eliminations          
Segment Reporting Information [Line Items]          
Total sales 13 12 37 37  
Transit Segment          
Segment Reporting Information [Line Items]          
Total sales 793 733 2,289 2,130  
Transit Segment | Operating Segments          
Segment Reporting Information [Line Items]          
Total sales 793 733 2,289 2,130  
Cost of sales (541) (526) (1,581) (1,528)  
Gross profit $ 252 $ 207 $ 708 $ 602  
Gross margin 31.70% 28.20% 30.90% 28.20%  
Selling, general & administrative expenses $ (118) $ (109) $ (339) $ (318)  
Engineering expenses (14) (13) (36) (32)  
Amortization expense (5) (6) (19) (17)  
Income from operations 115 79 314 235  
Interest expense and other, net 0 0 0 0  
Income before income taxes 115 79 314 235  
Depreciation and amortization 17 18 55 50  
Capital expenditures 14 12 36 37  
Segment assets 4,454 4,102 4,454 4,102  
Transit Segment | Intersegment eliminations          
Segment Reporting Information [Line Items]          
Total sales $ 14 $ 23 $ 35 $ 44