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Long-Term Investments - Equity Investments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 ST-Ericsson AT SA [Member]	Dec. 31, 2012 ST-Ericsson AT SA [Member]	Feb. 03, 2009 ST-Ericsson AT SA [Member]	Dec. 31, 2013 St-Ericsson SA [Member]	Dec. 31, 2012 St-Ericsson SA [Member]	Dec. 31, 2013 3Sun S.r.l. [Member]	Dec. 31, 2012 3Sun S.r.l. [Member]	Dec. 31, 2013 MicroOLED SAS [Member]	Sep. 30, 2013 MicroOLED SAS [Member]	Dec. 31, 2012 MicroOLED SAS [Member]	Sep. 30, 2012 MicroOLED SAS [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments, Ownership percentage				49.00%	50.00%	50.00%		33.30%	33.30%	39.60%		39.60%	39.60%
Equity investments, Carrying value	$ 63.0	$ 106.0		$ 9.0		$ 50.0		$ 13.0	$ 91.0		$ 4.1	$ 6.0	$ 7.0

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

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