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Supplemental Financial Information - Cash and cash equivalents (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Dec. 31, 2024
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 3,454		$ 3,292
SSMC
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	324		$ 261
Dividends	$ 0	$ 0
SSMC \| TSMC
Cash and Cash Equivalents [Line Items]
Ownership percentage by noncontrolling owners	38.80%