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Other Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Intangible Assets [Line Items]      
Purchase price allocation for recognition of technology $ 6    
Purchase price allocation for in-process R&D 4    
Amortization expense on capitalized software costs 38 33 30
Impairment on intangible assets 312    
Amortization expense 177 211 207
Contractual customer relationships [Member]
     
Other Intangible Assets [Line Items]      
Impairment on intangible assets 261    
Wireless capitalized software [Member]
     
Other Intangible Assets [Line Items]      
Impairment on intangible assets 45    
Acquired technology [Member]
     
Other Intangible Assets [Line Items]      
Impairment on intangible assets $ 6