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Related Party Transactions - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |
Research and development expenses |  | $ 121,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty | $ 282,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty
Accounts payable | 56,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent | 82,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent | 62,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
Contributed cash amounts to ST Foundation | 500,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | 500,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
JVD [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Research and development expenses |  | 121,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_JvdMember |
ST-Ericsson AT (JVD) [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Research and development expenses |  |  | 224,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_StEricssonAtJvdMember
Accounts payable |  |  | $ 44,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_StEricssonAtJvdMember

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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 3, 4 -Article 9 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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