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Post-Employment and Other Long-Term Employees Benefits - Changes in Benefit Obligation and Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Change in plan assets:      
Plan assets at fair value at beginning of year $ 422    
Employer contributions 29 34  
Plan assets at fair value at end of year 448 422  
Net amount recognized in the balance sheet consisted of the following:      
Non-current assets 10 5  
Long-term liabilities (366) (477)  
Pension benefits, Defined Benefit [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of year 901 794  
Service cost 37 40 34
Interest cost 28 31 33
Employee contributions 5 6  
Benefits paid (19) (21)  
Effect of curtailment (3)     
Effect of settlement (32) (31)  
Actuarial (gain) loss (92) 58  
Transfer in 12 70  
Transfer out (12) (70)  
Acquisition / change in scope 9     
Plan amendment 5 4  
ST-Ericsson deconsolidation (49)     
Foreign currency translation adjustment 17 20  
Benefit obligation at end of year 807 901 794
Change in plan assets:      
Plan assets at fair value at beginning of year 422 378  
Expected return on plan assets 18 18 20
Employer contributions 29 34  
Employee contributions 5 6  
Benefits paid (9) (11)  
Effect of settlement (25) (30)  
Actuarial gain (loss) 14 17  
Transfer in 8 40  
Transfer out (8) (40)  
Foreign currency translation adjustments 5 10  
ST-Ericsson deconsolidation (11)     
Plan assets at fair value at end of year 448 422 378
Funded status (359) (479)  
Net amount recognized in the balance sheet consisted of the following:      
Non-current assets 10 5  
Current liabilities (12) (16)  
Long-term liabilities (357) (468)  
Net amount recognized (359) (479)  
Other Pension Plans, Defined Benefit [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of year 63 52  
Service cost 8 9 8
Interest cost 2 3 3
Employee contributions        
Benefits paid (4) (3)  
Effect of curtailment (2)     
Effect of settlement        
Actuarial (gain) loss    2  
Transfer in 1 3  
Transfer out (1) (3)  
Acquisition / change in scope 1     
Plan amendment        
ST-Ericsson deconsolidation (4)     
Foreign currency translation adjustment 1     
Benefit obligation at end of year 65 63 52
Change in plan assets:      
Plan assets at fair value at beginning of year        
Expected return on plan assets         
Employer contributions        
Employee contributions        
Benefits paid        
Effect of settlement        
Actuarial gain (loss)        
Transfer in        
Transfer out        
Foreign currency translation adjustments        
ST-Ericsson deconsolidation        
Plan assets at fair value at end of year         
Funded status (65) (63)  
Net amount recognized in the balance sheet consisted of the following:      
Non-current assets        
Current liabilities (5) (3)  
Long-term liabilities (60) (60)  
Net amount recognized $ (65) $ (63)