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INTEREST EXPENSE, NET (Tables) | 12 Months Ended
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Dec. 31, 2012
Interest Expense, Net Consisted | Interest expense, net consisted of the following:
|  | Year ended December 31, 2012 |  |  | Year ended December 31, 2011 |  |  | Year ended December 31, 2010 |
Income |  |  | 41 |  |  |  | 21 |  |  |  | 31 |
Expense |  |  | (76 | ) |  |  | (46 | ) |  |  | (34 | )
Total |  |  | (35 | ) |  |  | (25 | ) |  |  | (3 | )

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- Definition Schedule of interest income net. + References No definition available. + Details
Name: | stm_ScheduleOfInterestIncomeNetTableTextBlock
Namespace Prefix: | stm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration