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Impairment, Restructuring Charges and Other Related Closure Costs (Details) (Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Impairment Restructuring Charges and Other Related Closure Costs (Additional) (Textual)            
Impairment charges       $ 4 $ 11 $ 35
Restructuring charges and other related closure costs       71 93 256
Other related closure costs       (28) (18) (35)
Impairment Restructuring Charges and Other Related Closure Costs (Textual)            
Expected payment 42     42 129  
Impairment charge on long-lived assets           21
Impairment on certain specific equipment           4
Impairment on goodwill              6
Other-than-temporary impairment charges of equity investments         1 (3)
Total amounts paid for restructuring and related closure costs       154 142  
Manufacturing Restructuring Plan [Member]
            
Impairment Restructuring Charges and Other Related Closure Costs (Additional) (Textual)            
Impairment charges       3 1 25
Restructuring charges and other related closure costs       34 26 101
Other related closure costs       (21) (11) (32)
Pre-tax charges incurred       311    
Expected to result in pre-tax charges, maximum 270     270    
Expected to result in pre-tax charges, minimum 300     300    
Impairment Restructuring Charges and Other Related Closure Costs (Textual)            
Total amounts paid for restructuring and related closure costs       87 27  
ST-Ericsson Restructuring Plan [Member]
            
Impairment Restructuring Charges and Other Related Closure Costs (Additional) (Textual)            
Impairment charges       1 10  
Expected Reduced Employee Headcount           1,200
Restructuring charges and other related closure costs         64 100
Employee termination and lease contract termination costs       6    
Termination benefits for employees       3 59  
Other related closure costs       (3) (5) (1)
Pre-tax charges incurred       170    
Expected to result in pre-tax charges, maximum 135     135    
Expected to result in pre-tax charges, minimum 155     155    
Impairment Restructuring Charges and Other Related Closure Costs (Textual)            
Total amounts paid for restructuring and related closure costs       50 81  
ST-Ericsson Cost Savings Plan [Member]
            
Impairment Restructuring Charges and Other Related Closure Costs (Additional) (Textual)            
Annual Saving under Restructuring Plan       120    
Expected Reduced Employee Headcount       500    
Restructuring charges and other related closure costs       26    
Pre-tax charges incurred       26    
Expected to result in pre-tax charges, maximum 70     70    
Expected to result in pre-tax charges, minimum 75     75    
Impairment Restructuring Charges and Other Related Closure Costs (Textual)            
Total amounts paid for restructuring and related closure costs       6    
Other Restructuring Initiatives [Member]
            
Impairment Restructuring Charges and Other Related Closure Costs (Additional) (Textual)            
Impairment charges           4
Restructuring charges and other related closure costs       5 3 55
Other related closure costs       (4) (2) (2)
Impairment Restructuring Charges and Other Related Closure Costs (Textual)            
Total amounts paid for restructuring and related closure costs       $ 11 $ 34