REVENUE (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 474	$ 460	$ 1,461	$ 1,354
Other revenue unrelated to contracts with customers	5	4	19	13
Total revenues	479	464	1,480	1,367
ATSI
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	261	273	837	792
TrAIL
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	65	66	189	197
MAIT
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 148	$ 121	$ 435	$ 365

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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