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Segment Information - Net Revenues by Product Segment and by Product Line (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net revenues | $ 9,664 | $ 8,347 | $ 6,973
Product Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 9,650 | 8,335 | 6,964
Automotive and Discrete Group (ADG) [Member] | Product Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 3,556 | 3,059 | 2,813
Analog, MEMS & Sensors Group (AMS) [Member] | Product Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 3,154 | 2,630 | 1,866
Microcontrollers and Digital ICs Group (MDG) [Member] | Product Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | 2,940 | 2,646 | 2,285
Others [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenues | $ 14 | $ 12 | $ 9

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