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Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]        
Goodwill, Beginning Balance     $ 1,059 $ 1,054
Business Combinations     1 10
Foreign currency translation     3 (5)
Impairment loss     (922)  
Goodwill, Ending Balance 141   141 1,059
Wireless Segment (Wireless) [Member]
        
Goodwill [Line Items]        
Goodwill, Beginning Balance     921 923
Business Combinations          
Foreign currency translation     1 (2)
Impairment loss (232) (690) (922)  
Goodwill, Ending Balance       921
Analog, MEMS and Microcontrollers Sector (AMM) [Member]
        
Goodwill [Line Items]        
Goodwill, Beginning Balance     95 88
Business Combinations     1 10
Foreign currency translation     2 (3)
Goodwill, Ending Balance 98   98 95
Digital [Member]
        
Goodwill [Line Items]        
Goodwill, Beginning Balance     43 43
Business Combinations          
Foreign currency translation          
Goodwill, Ending Balance $ 43   $ 43 $ 43