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SEGMENT INFORMATION - Summary of Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | $ 2,706 | $ 2,644 | $ 5,316 | $ 5,141 |
Cost of sales | (1,768) | (1,770) | (3,478) | (3,452) |
Gross profit | 938 | 874 | 1,838 | 1,689 |
Selling, general & administrative expenses | (347) | (316) | (654) | (597) |
Engineering expenses | (50) | (57) | (96) | (105) |
Amortization expense | (69) | (71) | (142) | (145) |
Income from operations | 472 | 430 | 946 | 842 |
Interest expense and other, net | (22) | (45) | (70) | (94) |
Income before income taxes | 450 | 385 | 876 | 748 |
Depreciation and amortization | 117 | 118 | 237 | 241 |
Capital expenditures | 39 | 46 | 83 | 77 |
Segment assets | 20,391 | 18,876 | 20,391 | 18,876 | $ 18,702
Intersegment eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | (25) | (22) | (45) | (46) |
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 | (52) | (43) | (88) | (73) |
Engineering expenses | 0 | 0 | 0 | 0 |
Amortization expense | 0 | 0 | 0 | 0 |
Income from operations | (52) | (43) | (88) | (73) |
Interest expense and other, net | (22) | (45) | (70) | (94) |
Income before income taxes | (74) | (88) | (158) | (167) |
Depreciation and amortization | 4 | 4 | 7 | 8 |
Capital expenditures | 2 | 1 | 5 | 2 |
Segment assets | 2,596 | 1,604 | 2,596 | 1,604 |
Freight Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 1,919 | 1,920 | 3,820 | 3,744 |
Freight Segment | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 1,919 | 1,920 | 3,820 | 3,744 |
Cost of sales | (1,222) | (1,251) | (2,438) | (2,450) |
Gross profit | $ 697 | $ 669 | $ 1,382 | $ 1,294 |
Gross margin | 36.30% | 34.80% | 36.20% | 34.60% |
Selling, general & administrative expenses | $ (181) | $ (165) | $ (345) | $ (315) |
Engineering expenses | (38) | (47) | (74) | (86) |
Amortization expense | (63) | (66) | (128) | (134) |
Income from operations | 415 | 391 | 835 | 759 |
Interest expense and other, net | 0 | 0 | 0 | 0 |
Income before income taxes | 415 | 391 | 835 | 759 |
Depreciation and amortization | 95 | 98 | 192 | 201 |
Capital expenditures | 25 | 33 | 56 | 50 |
Segment assets | 13,390 | 13,355 | 13,390 | 13,355 |
Freight Segment | Intersegment eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 13 | 12 | 24 | 25 |
Transit Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 787 | 724 | 1,496 | 1,397 |
Transit Segment | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 787 | 724 | 1,496 | 1,397 |
Cost of sales | (546) | (519) | (1,040) | (1,002) |
Gross profit | $ 241 | $ 205 | $ 456 | $ 395 |
Gross margin | 30.70% | 28.30% | 30.50% | 28.30% |
Selling, general & administrative expenses | $ (114) | $ (108) | $ (221) | $ (209) |
Engineering expenses | (12) | (10) | (22) | (19) |
Amortization expense | (6) | (5) | (14) | (11) |
Income from operations | 109 | 82 | 199 | 156 |
Interest expense and other, net | 0 | 0 | 0 | 0 |
Income before income taxes | 109 | 82 | 199 | 156 |
Depreciation and amortization | 18 | 16 | 38 | 32 |
Capital expenditures | 12 | 12 | 22 | 25 |
Segment assets | 4,405 | 3,917 | 4,405 | 3,917 |
Transit Segment | Intersegment eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | $ 12 | $ 10 | $ 21 | $ 21 |

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