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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2012
Changes in Value of Marketable Securities Reported in Current and Non-Current Assets on Consolidated Balance Sheets | Changes in the value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2012 and December 31, 2011 are detailed in the tables below:
In millions of U.S. dollars |  | December 31, 2011 |  |  | Purchase |  |  | Sale/ Settlement |  |  | Change in fair value included in OCI* for available- for-sale marketable securities |  |  | Change in fair value recognized in earnings |  |  | Foreign exchange result through OCI* |  |  | December 31, 2012 |
Debt securities issued by the U.S. Treasury |  |  | 100 |  |  |  | 450 |  |  |  | (400 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 150 |
Debt securities issued by foreign governments |  |  | 81 |  |  |  | — |  |  |  | (81 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Fixed rate debt securities issued by financial institutions |  |  | 27 |  |  |  | — |  |  |  | (25 | ) |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | — |
Senior debt Floating Rate Notes issued by financial institutions |  |  | 205 |  |  |  | — |  |  |  | (124 | ) |  |  | 6 |  |  |  | 1 |  |  |  | — |  |  |  | 88 |
Total |  |  | 413 |  |  |  | 450 |  |  |  | (630 | ) |  |  | 6 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 238 |
* | Other Comprehensive Income
In millions of U.S. dollars |  | December 31, 2010 |  |  | Purchase |  |  | Sale/ Settlement |  |  | Change in fair value included in OCI* for available- for-sale marketable securities |  |  | Change in fair value recognized in earnings |  |  | Realized gain |  |  | Foreign exchange result through OCI* |  |  | December 31, 2011 |
Debt securities issued by the U.S. Treasury |  |  | 350 |  |  |  | 100 |  |  |  | (350 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 100 |
Debt securities issued by foreign governments |  |  | 213 |  |  |  | 225 |  |  |  | (355 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | 81 |
Fixed rate debt securities issued by financial institutions |  |  | — |  |  |  | 27 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 27 |
Senior debt Floating Rate Notes issued by financial institutions |  |  | 328 |  |  |  | — |  |  |  | (113 | ) |  |  | (2 | ) |  |  | (5 | ) |  |  | — |  |  |  | (3 | ) |  |  | 205 |
Auction Rate Securities |  |  | 72 |  |  |  | — |  |  |  | (350 | ) |  |  | (45 | ) |  |  | — |  |  |  | 323 |  |  |  | — |  |  |  | — |
Equity securities classified as available-for-sale |  |  | 161 |  |  |  | — |  |  |  | (189 | ) |  |  | 14 |  |  |  | 14 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  |  | 1,124 |  |  |  | 352 |  |  |  | (1,357 | ) |  |  | (33 | ) |  |  | 9 |  |  |  | 323 |  |  |  | (5 | ) |  |  | 413 |
* | Other Comprehensive Income

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- Definition Changes in value of marketable securities reported in current and noncurrent assets on consolidated balance sheets. + References No definition available. + Details
Name: | stm_ChangesInValueOfMarketableSecuritiesReportedInCurrentAndNoncurrentAssetsOnConsolidatedBalanceSheetsTableTextBlock
Namespace Prefix: | stm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration