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Fair value measurements - Schedule of Effect of Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2023 | Jan. 01, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain/(Loss) Recognized In Accumulated OCI |  |  | $ (131) | $ 197
Cross currency interest rate swaps contracts: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain/(Loss) Recognized In Accumulated OCI |  |  | $ 642 | $ 766
Other (Income) Expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain/(Loss) Reclassified From Accumulated OCI Into Income | $ 0 | $ 0 |  |
Other (Income) Expense | Cross currency interest rate swaps contracts: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain/(Loss) Reclassified From Accumulated OCI Into Income | $ 0 | $ 0 |  |

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