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Additional financial information - Other current assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Prepayments | $ 343 | $ 285 | $ 241
Other | 361 | 193 | 163
Total other current assets | $ 704 | $ 478 | $ 404

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