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Revenues - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020
Disaggregation of Revenue [Line Items] |
Revenue recognition and disaggregation payment terms description | The payment terms typically range between 30 and 90 days.
Minimum [Member] |
Disaggregation of Revenue [Line Items] |
Revenue recognition and disaggregation payment terms | 30 days
Maximum [Member] |
Disaggregation of Revenue [Line Items] |
Revenue recognition and disaggregation payment terms | 90 days

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- Definition Revenue recognition and disaggregation payment terms. + References No definition available. + Details
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Namespace Prefix: | stm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of payment terms in contract with customer. Includes, but is not limited to, timing of payment, existence of financing component, variability of consideration and constraint on variable consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |