Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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SEGMENT INFORMATION - Schedule of Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Total sales	$ 3,120	$ 2,886	$ 9,249	$ 8,202
Freight Segment
Segment Reporting [Line Items]
Total sales	2,237	2,093	6,595	5,913
Transit Segment
Segment Reporting [Line Items]
Total sales	883	793	2,654	2,289
Services
Segment Reporting [Line Items]
Total sales	493	461	1,421	1,394
Services \| Freight Segment
Segment Reporting [Line Items]
Total sales	794	744	2,256	2,388
Equipment \| Freight Segment
Segment Reporting [Line Items]
Total sales	679	677	2,142	1,699
Components \| Freight Segment
Segment Reporting [Line Items]
Total sales	395	375	1,150	1,157
Digital Intelligence \| Freight Segment
Segment Reporting [Line Items]
Total sales	369	297	1,047	669
Original Equipment Manufacturer \| Transit Segment
Segment Reporting [Line Items]
Total sales	408	367	1,200	1,042
Aftermarket \| Transit Segment
Segment Reporting [Line Items]
Total sales	$ 475	$ 426	$ 1,454	$ 1,247