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Goodwill and intangible assets - Composition of Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 159 |  | $ 153 | $ 148
Total intangible assets | 62 |  | 61 |
Accumulated amortization | (41) |  | (36) |
Total intangible assets, net | 21 |  | 25 |
Impairment of digital assets | 0 | $ 11 |  |
Licenses and Others |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortizable intangible assets | 14 |  | 13 |
Non-Compete Agreement |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortizable intangible assets | 4 |  | 4 |
Customer Lists |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortizable intangible assets | 12 |  | 12 |
Trademarks |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortizable intangible assets | 13 |  | 12 |
Hub Network |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortizable intangible assets | 4 |  | 4 |
Other Intangible Assets |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortizable intangible assets | 3 |  | 3 |
Trademarks |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Intangible assets with indefinite lives | 3 |  | 4 |
Digital Assets |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Intangible assets with indefinite lives | 9 |  | 9 |
Impairment of digital assets | $ 21 |  | $ 21 |

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