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Long-Term Investments - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jun. 30, 2013 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 EUR (€) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Sep. 09, 2013 USD ($) | Aug. 02, 2013 JVD [Member] USD ($) | Sep. 09, 2013 JVS [Member] USD ($) | Dec. 31, 2013 JVS [Member] USD ($) | Dec. 31, 2013 St-Ericsson SA [Member] USD ($) | Dec. 31, 2012 St-Ericsson SA [Member] USD ($) | Feb. 03, 2009 St-Ericsson SA [Member] | Dec. 31, 2013 ST-Ericsson AT SA [Member] USD ($) | Dec. 31, 2012 ST-Ericsson AT SA [Member] USD ($) | Feb. 03, 2009 ST-Ericsson AT SA [Member] | Jun. 30, 2013 3Sun S.r.l. [Member] EUR (€) | Dec. 31, 2013 3Sun S.r.l. [Member] USD ($) | Dec. 31, 2013 3Sun S.r.l. [Member] EUR (€) | Dec. 31, 2012 3Sun S.r.l. [Member] USD ($) | Dec. 31, 2013 MicroOLED SAS [Member] USD ($) | Sep. 30, 2013 MicroOLED SAS [Member] USD ($) | 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% |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  | 49.00% | 50.00% |  | 33.30% |  | 33.30% | 39.60% |  | 39.60% | 39.60% |
Equity-method investments |  | $ 63.0 |  | $ 106.0 |  |  | $ 4.0 |  | $ 50.0 | $ 50.0 |  |  |  | $ 9.0 |  |  | $ 13.0 |  | $ 91.0 |  | $ 4.1 | $ 6.0 | $ 7.0 | $ 4.0
Sale of Stock |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of retained non-controlling interest |  |  |  |  |  | 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deconsolidated gain or loss |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funding commitment letters capped amount |  | 149 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in capital |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan conversion to equity |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges | 69 | 109 |  | 1,268 | 4 |  |  |  |  |  |  |  |  |  |  | 159 |  |  |  |  |  |  |  |
Income (loss) on equity-method investments |  | (122) |  | (24) | (28) |  |  |  |  |  |  |  |  |  |  |  | 35 |  |  |  |  |  |  |
Shareholder's loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |
Possible future equity contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 7 |  |  |  |  |  |

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