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Impairment, Restructuring Charges and Other Related Closure Costs - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Carrollton [Member]
Dec. 31, 2012
Other Restructuring Initiatives [Member]
Long Lived Assets [Member]
Sep. 30, 2012
Wireless [Member]
Dec. 31, 2012
Wireless [Member]
Dec. 31, 2012
Wireless [Member]
St-Ericsson exit [Member]
Dec. 31, 2012
Wireless [Member]
Goodwill [Member]
Dec. 31, 2012
Wireless [Member]
Contractual customer relationships [Member]
Dec. 31, 2012
Wireless [Member]
Capitalized software [Member]
Dec. 31, 2012
Wireless [Member]
Acquired technology [Member]
Dec. 31, 2012
Digital restructuring plan [Member]
Employees
Dec. 31, 2012
ST-Ericsson April 2012 restructuring plan [Member]
Employees
Dec. 31, 2012
ST-Ericsson Cost Savings Plan [Member]
Dec. 31, 2011
ST-Ericsson Cost Savings Plan [Member]
Employees
Dec. 31, 2012
ST-Ericsson Restructuring Plan [Member]
Dec. 31, 2011
ST-Ericsson Restructuring Plan [Member]
Dec. 31, 2010
ST-Ericsson Restructuring Plan [Member]
Dec. 31, 2009
ST-Ericsson Restructuring Plan [Member]
Employees
Dec. 31, 2012
Manufacturing Restructuring Plan [Member]
Dec. 31, 2011
Manufacturing Restructuring Plan [Member]
Dec. 31, 2010
Manufacturing Restructuring Plan [Member]
Dec. 31, 2012
Other Restructuring Initiatives [Member]
Dec. 31, 2011
Other Restructuring Initiatives [Member]
Dec. 31, 2010
Other Restructuring Initiatives [Member]
Dec. 31, 2012
St-Ericsson April 2012 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]                                                      
Impairment charges $ 1,268 $ 4 $ 11 $ 21 $ 2 $ 690 $ 1,234 $ 544 $ 922 $ 261 $ 45 $ 6                 $ 21 $ 3 $ 1          $ 2
Impairment charges on intangibles 4                       7                            
Annual Saving under Restructuring Plan                         150     120                      
Expected Reduced Employee Headcount                         500 1,700   500       1,200              
Other restructuring cost 108 71 93                   13 64 20 26   6 64     34 26 11 5 3  
Termination benefits for employees 84 43 75                     60       3 59      13 15    1 1 60
Other related closure costs 24 28 18                     4       3 5   2 21 11 8 4 2 4
Expected payment 75 42                                                  
Pre-tax charges incurred                         13   46   171       313           64
Expected to result in pre-tax charges, maximum                         30   150   155       300            
Expected to result in pre-tax charges, minimum                         25   130   135       270            
Total amounts paid for restructuring and related closure costs $ 73