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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Transactions with significant shareholders their affiliates and other related parties
Sales & other services	$ 269	$ 322	$ 356
Research and development expenses	(235)	(206)	(201)
Other purchases	(60)	(94)	(167)
Accounts receivable	54	53	58
Accounts payable	42	63	60
Related Party Transactions (Textual) [Abstract]
Contributed cash amounts to ST Foundation	1	1
ST-Ericsson AT (JVD) [Member]
Transactions with significant shareholders their affiliates and other related parties
Research and development expenses	(194)	(136)
Accounts payable	$ 23	$ 21

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Other purchases from transactions with related party realized during the period.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Expenses recognized during the period resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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