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Segment Information - Net Revenues by Product Segment and by Product Line (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 10,219	$ 9,556	$ 9,664
Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	10,206	9,543	9,650
Automotive and Discrete Group (ADG) [Member] | Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	3,284	3,606	3,556
Analog, MEMS & Sensors Group (AMS) [Member] | Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	3,892	3,299	3,154
Microcontrollers and Digital ICs Group (MDG) [Member] | Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	3,030	2,638	2,940
Others [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 13	$ 13	$ 14

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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