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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
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