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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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