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SEGMENT INFORMATION - Summary of Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total sales $ 10,387 $ 9,677 $ 8,362
Cost of sales (7,021) (6,733) (5,822)
Gross profit 3,366 2,944 2,540
Selling, general and administrative expenses (1,248) (1,139) (1,029)
Engineering expenses (206) (218) (209)
Amortization expense (303) (321) (291)
Income (loss) from operations 1,609 1,266 1,011
Other income, net 2 44 29
Interest expense and other, net (199) (174) (157)
Income before income taxes 1,410 1,092 854
Depreciation and amortization 503 531 479
Capital expenditures 207 186 149
Segment assets 18,702 18,988  
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total sales (107) (100) (80)
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Segment Reporting Information [Line Items]      
Total sales 0 0 0
Cost of sales 0 0 0
Gross profit 0 0 0
Selling, general and administrative expenses (151) (94) (84)
Engineering expenses 0 0 0
Amortization expense 0 0 0
Income (loss) from operations (151) (94) (84)
Interest expense and other, net (199) (174) (157)
Income before income taxes (350) (268) (241)
Depreciation and amortization 17 17 20
Capital expenditures 5 9 8
Segment assets 1,665 1,627  
Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 7,468 6,923 5,979
Freight Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Total sales 7,468 6,923 5,979
Cost of sales (4,945) (4,742) (4,090)
Gross profit $ 2,523 $ 2,181 $ 1,889
Gross margin 33.80% 31.50% 31.60%
Selling, general and administrative expenses $ (664) $ (637) $ (580)
Engineering expenses (164) (180) (177)
Amortization expense (273) (299) (272)
Income (loss) from operations 1,422 1,065 860
Interest expense and other, net 0 0 0
Income before income taxes 1,422 1,065 860
Depreciation and amortization 413 442 398
Capital expenditures 140 119 86
Segment assets 13,176 13,417  
Freight Segment | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total sales 48 58 48
Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 2,919 2,754 2,383
Transit Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Total sales 2,919 2,754 2,383
Cost of sales (2,076) (1,991) (1,732)
Gross profit $ 843 $ 763 $ 651
Gross margin 28.90% 27.70% 27.30%
Selling, general and administrative expenses $ (433) $ (408) $ (365)
Engineering expenses (42) (38) (32)
Amortization expense (30) (22) (19)
Income (loss) from operations 338 295 235
Interest expense and other, net 0 0 0
Income before income taxes 338 295 235
Depreciation and amortization 73 72 61
Capital expenditures 62 58 55
Segment assets 3,861 3,944  
Transit Segment | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total sales $ 59 $ 42 $ 32