Fair value measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023
Derivative [Line Items]
Deferred net losses (gains) on derivatives included in accumulated other comprehensive income	$ (377)
Description of reclassification of cash flow hedge gain (loss)	next 12 months
Maximum length of time for hedging transaction exposure	18 months
Foreign exchange contracts
Derivative [Line Items]
Collateral paid	$ 4,000	$ 800
Derivative, notional amount	42,900	41,500
Cross currency interest rate swaps
Derivative [Line Items]
Derivative, notional amount	39,700	36,200
Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	10,000	10,000
Equity securities | Equity Investments without readily determinable value
Derivative [Line Items]
Equity, fair value adjustment, impairment loss	(1)	(51)
Equity, fair value adjustment, change in observable prices	$ 27	$ 142