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Derivative instruments - Summary of Unrealized Gains and Losses Recognized in AOCI (Details) - Cash flow hedge - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized (losses) gains | $ (158) | $ 176 | $ 137 | $ 155
Foreign currency forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized (losses) gains | (238) | 198 | 87 | 222
Cross-currency swap contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized (losses) gains | 80 | (22) | 50 | (36)
Forward interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized (losses) gains | $ 0 | $ 0 | $ 0 | $ (31)

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