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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 |

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