Fair value measurements - Narrative (Details) - USD ($) $ in Millions			12 Months Ended
	May 17, 2024	May 15, 2024	Dec. 29, 2024	Dec. 31, 2023
Derivative [Line Items]
Deferred net losses (gains) on derivatives included in accumulated other comprehensive income			$ 1,700
Description of reclassification of cash flow hedge gain (loss)			next 12 months
Maximum length of time for hedging transaction exposure			18 months
Commercial paper		$ 3,600
Proceeds from issuance of commercial paper		$ 3,600
Debt for equity exchange, shares exchanged (in shares)	182,329,550
Loss on shares exchanged	$ 400
Foreign exchange contracts
Derivative [Line Items]
Collateral paid			$ 2,200	$ 4,000
Derivative, notional amount			45,100	42,900
Cross currency interest rate swaps
Derivative [Line Items]
Derivative, notional amount			40,500	39,700
Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount			9,000	10,000
Equity securities | Equity Investments without readily determinable value
Derivative [Line Items]
Equity, fair value adjustment, impairment loss			(171)	(1)
Equity, fair value adjustment, change in observable prices			$ (26)	$ 27