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Long-Term Debt - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended | 1 Months Ended |  | 12 Months Ended
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Feb. 23, 2011 USD ($) Bonds | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 Medium Term Credit Facilities [Member] USD ($) | Dec. 31, 2011 ST-Ericsson [Member] USD ($) | Dec. 31, 2012 R and D project in France [Member] USD ($) | Dec. 31, 2012 R and D project in France [Member] EUR (€) | Dec. 31, 2012 R and D projects in Italy [Member] USD ($) | Dec. 31, 2012 R and D projects in Italy [Member] EUR (€) | Dec. 31, 2012 Multi currency loan to support our industrial and R&D programs [Member] USD ($) | Dec. 31, 2012 Multi currency loan to support our industrial and R&D programs [Member] EUR (€) | Mar. 28, 2012 1.50% convertible bonds due 2016 [Member] Bonds | Mar. 01, 2012 1.50% convertible bonds due 2016 [Member] USD ($) Bonds | Feb. 23, 2012 1.50% convertible bonds due 2016 [Member] Bonds | Feb. 28, 2006 1.50% convertible bonds due 2016 [Member] USD ($) | Dec. 31, 2012 1.50% convertible bonds due 2016 [Member] Bonds | Dec. 31, 2011 1.50% convertible bonds due 2016 [Member] USD ($) Bonds | Dec. 31, 2010 1.50% convertible bonds due 2016 [Member] USD ($) Bonds | Dec. 31, 2009 1.50% convertible bonds due 2016 [Member] USD ($) Bonds | Feb. 23, 2012 1.50% convertible bonds due 2016 [Member] Subsequent Event [Member] USD ($) | Mar. 31, 2006 0.58%, due 2013, floating interest rate at Euribor + 0.40% [Member] EUR (€) | Dec. 31, 2011 Credit Facilities [Member] EUR (€) Bonds | Dec. 31, 2010 Credit Facilities [Member] EUR (€) Bonds
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zero coupon unsubordinated convertible bonds, Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,131,000,000 |  |  |  |  |  | € 500,000,000 |  |
Bonds issued percentage of principal value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100% of principal with a yield to maturity |  |  |  |  |  |  |  |
Zero coupon unsubordinated convertible bonds, yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |
Proceeds from long-term debt |  | 464,000,000 | 3,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  | 974,000,000 |  |  |  |  |  |  |  |
Conversion rate of bonds per one thousand dollar face value of bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43.833898 |  |  |  |  |  |
Bonds convertible number of equivalent shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,694,216 |  |  |  |  |  |
Number of bonds repurchased |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 | 5,000 | 190,000 |  | 0 | 290,000 | 386,000 | 98,000 |  |  | 76,000 | 74,000
Principal value of purchased bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 318,000,000 | 417,000,000 | 106,000,000 |  |  |  |
Cash consideration |  | 109,000,000 | 108,000,000 | 218,000,000 |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  | 314,000,000 | 410,000,000 | 103,000,000 |  |  | 107,000,000 | 98,000,000
Gain on the repurchase of bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 7,000,000 | 3,000,000 |  |  |  |
Bonds redeemed for cash | 41,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bond principal amount | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for bond | 44,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption Price of convertible bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,093.81 |  |  |
Number of bonds outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |
Percentage of Bonds repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |
Issue price as percentage of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.873% |  |
Coupon rate of Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Three-month Euribor plus 0.40% |  |
Unutilized committed medium term credit facilities |  |  |  |  | 490,000,000 | 400,000,000 | 341,000,000 | 245,000,000 | 380,000,000 | 250,000,000 | 453,000,000 | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | $ 145,000,000 |  | $ 217,000,000 |  | $ 453,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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