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Derivative instruments - Schedule of Effective Portion of Unrealized Gain (Loss) Recognized in AOCI (Details) - Cash flow hedge - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized gains (losses) | $ 73 | $ (158) | $ (396) | $ 137
Foreign currency forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized gains (losses) | 123 | (238) | (592) | 87
Cross-currency swap contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized gains (losses) | $ (50) | $ 80 | $ 196 | $ 50

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