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