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Additional financial information - Other current assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Prepayments | $ 358 | $ 285 | $ 249
Other | 390 | 193 | 167
Total other current assets | $ 748 | $ 478 | $ 416

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