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Fair value measurements - Summary of Derivative Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2026	Jun. 29, 2025	Jun. 28, 2026	Jun. 29, 2025
Income Statement Location [Axis]: us-gaap:InvestmentIncomeInterest
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from AOCI into income	$ 0	$ 0	$ 0	$ 0
Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:InvestmentIncomeInterest
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from AOCI into income	0	0	0	0
Fair Value Hedging \| Interest Rate Swap \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0	0	0
Amount of gain or (loss) recognized in AOCI	0	0	0	0
Fair Value Hedging \| Interest Rate Swap \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing			5	240
Amount of gain or (loss) recognized in AOCI	31	(52)
Fair Value Hedging \| Interest Rate Swap \| Income Statement Location [Axis]: us-gaap:InvestmentIncomeInterest
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	(31)	52
Amount of gain or (loss) recognized in AOCI			(5)	(240)
Fair Value Hedging \| Interest Rate Swap \| Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0	0	0
Amount of gain or (loss) recognized in AOCI	0	0	0	0
Fair Value Hedging \| Interest Rate Swap \| Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0	0	0
Amount of gain or (loss) recognized in AOCI	0	0	0	0
Fair Value Hedging \| Interest Rate Swap \| Income Statement Location [Axis]: us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0	0	0
Amount of gain or (loss) recognized in AOCI	0	0	0	0
Fair Value Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing			0	0
Amount of gain or (loss) recognized in AOCI			0	0
Fair Value Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing			92	98
Amount of gain or (loss) recognized in AOCI			92	98
Fair Value Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing			0	0
Amount of gain or (loss) recognized in AOCI			0	0
Fair Value Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing			0	0
Amount of gain or (loss) recognized in AOCI			0	0
Fair Value Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing			0	0
Amount of gain or (loss) recognized in AOCI			0	0
Net Investment Hedging \| Net Investment Hedging \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0
Amount of gain or (loss) recognized in AOCI	0	0
Net Investment Hedging \| Net Investment Hedging \| Income Statement Location [Axis]: us-gaap:InvestmentIncomeInterest
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	45	48
Amount of gain or (loss) recognized in AOCI	45	48
Net Investment Hedging \| Net Investment Hedging \| Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0
Amount of gain or (loss) recognized in AOCI	0	0
Net Investment Hedging \| Net Investment Hedging \| Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0
Amount of gain or (loss) recognized in AOCI	0	0
Net Investment Hedging \| Net Investment Hedging \| Income Statement Location [Axis]: us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivative amount excluded from effectiveness testing	0	0
Amount of gain or (loss) recognized in AOCI	0	0
Cash Flow Hedging \| Forward foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in AOCI	(190)	466	(385)	571
Amount of gain or (loss) reclassified from AOCI into income	90	(132)	163	(122)
Cash Flow Hedging \| Forward foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in AOCI			0	0
Amount of gain or (loss) reclassified from AOCI into income			0	0
Cash Flow Hedging \| Forward foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:InvestmentIncomeInterest
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in AOCI	0	0
Amount of gain or (loss) reclassified from AOCI into income	0	0
Cash Flow Hedging \| Forward foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in AOCI	18	(29)	43	(40)
Amount of gain or (loss) reclassified from AOCI into income	3	(3)	1	(3)
Cash Flow Hedging \| Forward foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in AOCI	40	(72)	77	(108)
Amount of gain or (loss) reclassified from AOCI into income	10	(16)	5	(15)
Cash Flow Hedging \| Forward foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in AOCI	(5)	11	(12)	14
Amount of gain or (loss) reclassified from AOCI into income	(2)	2	(1)	1
Cash Flow Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in AOCI	0	0	0	0
Amount of gain or (loss) reclassified from AOCI into income	0	0	0	0
Cash Flow Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
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Amount of gain or (loss) recognized in AOCI				673
Amount of gain or (loss) reclassified from AOCI into income			165	158
Cash Flow Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:InvestmentIncomeInterest
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Amount of gain or (loss) recognized in AOCI	(47)	108	(31)
Amount of gain or (loss) reclassified from AOCI into income	82	76
Cash Flow Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
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Amount of gain or (loss) recognized in AOCI	0	0	0	0
Amount of gain or (loss) reclassified from AOCI into income	0	0	0	0
Cash Flow Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
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Amount of gain or (loss) recognized in AOCI	0	0	0	0
Amount of gain or (loss) reclassified from AOCI into income	0	0	0	0
Cash Flow Hedging \| Cross currency interest rate swaps \| Income Statement Location [Axis]: us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
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Amount of gain or (loss) recognized in AOCI	0	0	0	0
Amount of gain or (loss) reclassified from AOCI into income	$ 0	$ 0	$ 0	$ 0