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Business Combinations - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 02, 2019 USD ($) | Feb. 06, 2019 USD ($) | Dec. 31, 2020 USD ($) Acquisition | Sep. 30, 2020 Acquisition | Jun. 30, 2020 Acquisition | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisitions, deferred consideration |  |  | $ 20 |  |  | $ 20 |  |
Payment for business acquisitions, net of cash and cash equivalents acquired |  |  |  |  |  | 113 | $ 127 |
Deferred and contingent consideration recognized |  |  | 143 |  |  | 143 |  |
Goodwill |  |  | $ 330 |  |  | 330 | 162 | $ 121
2020 Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Name of acquired entity |  |  | minor acquisition in the Microcontrollers and Digital ICs Group | entire share capital of Ultra Wide Band specialist BeSpoon, of the cellular IoT connectivity assets of Riot Micro and of the radio-frequency assets of SOMOS | French Gallium Nitride (GaN) innovator Exagan |  |  |
Number of Acquisitions | Acquisition |  |  | 1 | 3 | 1 |  |  |
Payment for business acquisitions, before cash acquired |  |  |  |  |  | 104 |  |
Cash acquired |  |  |  |  |  | 1 |  |
Business acquisitions, deferred consideration |  |  | $ 18 |  |  | 18 |  |
Business acquisitions, contingent consideration |  |  | 117 |  |  | 117 |  |
Payment for business acquisitions, net of cash and cash equivalents acquired |  |  |  |  |  | 103 |  |
Deferred and contingent consideration recognized |  |  | 143 |  |  | 143 |  |
Fair value of business acquired |  |  | 239 |  |  | 239 |  |
Deferred tax assets |  |  | 5 |  |  | 5 |  |
Deferred tax liabilities |  |  | 18 |  |  | 18 |  |
Goodwill |  |  | $ 135 |  |  | $ 135 |  |
2020 Acquisitions [Member] | Discount Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Discount rate |  |  | 1.55 |  |  | 1.55 |  |
2020 Acquisitions [Member] | Discount Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Discount rate |  |  | 4.07 |  |  | 4.07 |  |
Norstel AB [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash acquired |  |  |  |  |  |  | 1 |
Percentage of business acquired | 45.00% | 55.00% |  |  |  |  |  |
Fair value of business acquired |  |  | $ 138 |  |  | $ 138 | 138 |
Consideration paid | $ 51 | $ 77 |  |  |  |  |  |
Deferred tax assets |  |  | 4 |  |  | 4 |  |
Deferred tax liabilities |  |  | 18 |  |  | 18 |  |
Increase in goodwill |  |  |  |  |  | 14 |  |
Goodwill |  |  | $ 57 |  |  | $ 57 | 43 |
Norstel AB [Member] | Restricted Cash Current [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Escrow account |  |  |  |  |  |  | $ 10 |

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