XML 126 R113.htm IDEA: XBRL DOCUMENT v3.10.0.1

Other Income and Expenses, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Income recognition accrual amount	$ 42	$ 33

X

- Definition

Income recognition accrual amount.

+ References

No definition available.

+ Details

Name:	stm_IncomeRecognitionAccrualAmount
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration