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Long-Term Investments - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
ST-Ericsson AT SA [Member]
USD ($)
Dec. 31, 2011
ST-Ericsson AT SA [Member]
USD ($)
Feb. 03, 2009
ST-Ericsson AT SA [Member]
USD ($)
Dec. 31, 2012
3Sun S.r.l. [Member]
USD ($)
Dec. 31, 2012
3Sun S.r.l. [Member]
EUR (€)
Dec. 31, 2011
3Sun S.r.l. [Member]
USD ($)
Dec. 31, 2012
MicroOLED SAS [Member]
USD ($)
Sep. 30, 2012
MicroOLED SAS [Member]
USD ($)
Sep. 30, 2012
MicroOLED SAS [Member]
Identification of Technology Intangibles [Member]
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Controlling share held by Ericsson         50.00%         39.60%  
Equity-method investments $ 106 $ 94 $ 9 $ 16 $ 99 $ 91   $ 78 $ 6 $ 7 $ 4
Impairment charges     4                
Income (loss) on equity investments and gain on investment divestiture     7                
Share holder loan           28          
Possible future equity contributions             € 14