REVENUE (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 485	$ 464
Other revenue unrelated to contracts with customers	7	4
Total revenues	492	468
ATSI
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	282	263
TrAIL
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	65	70
MAIT
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 138	$ 131

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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