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Post-Employment and Other Long-Term Employees Benefits - Reconciliation for Plan Assets Measured at Fair Value Using Unobservable Inputs (Level 3) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at end of year $ 448 $ 422
Fair Value, Inputs, Level 3 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year 120 104
Actual return on plan assets   3
Contributions (employer and employee) 15 16
Benefits paid (2) (3)
Settlements (23) (7)
Reclassification to Level 3   4
ST-Ericsson deconsolidation (4)  
Foreign currency translation adjustment 3 3
Plan assets at fair value at end of year $ 109 $ 120