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GOODWILL AND INTANGIBLE ASSETS - Composition of Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 161 | $ 149 | $ 163
Total intangible assets | 86 | 52 |
Accumulated amortization | (48) | (40) |
Total intangible assets, net | 38 | 12 |
Naming rights |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 31 | 0 |
Licenses and others |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 19 | 18 |
Non-compete agreements |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 3 | 3 |
Customer lists |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 15 | 14 |
Trademarks |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 7 | 7 |
Hubs network |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 4 | 3 |
Others |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets | 3 | 3 |
Trademarks |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets with indefinite lives | $ 4 | $ 4 |

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