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Post-Retirement and Other Long-Term Employees Benefits - Components of Net Periodic Benefit Cost (Parenthetical) (Detail) (ST-Ericsson [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
ST-Ericsson [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost $ 4