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Derivative instruments - 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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | $ 28 | $ 84 | $ 159
Foreign currency forward contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | (14) | 308 | 373
Cross-currency swap contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | 73 | (219) | (214)
Forward interest rate contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains | $ (31) | $ (5) | $ 0

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