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Derivative instruments - Schedule of Effective Portion of Unrealized Gain (Loss) Recognized in AOCI (Details) - Cash flow hedge - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | $ 506 | $ 28 | $ 84
Foreign currency forward contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | 585 | (14) | 308
Cross-currency swap contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | (79) | 73 | (219)
Forward interest rate contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | $ 0 | $ (31) | $ (5)

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