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Revenues - Additional Information (Detail)	12 Months Ended
	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

X

- 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

X

- 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

X

- 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

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Period Type: