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Segment Information - Operating Income loss by Product Segment (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) $ (2,081) $ 46 $ 476
Automotive ("APG") [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) 129 227 121
Digital [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) (154) 108 245
Analog MEMS And Microcontrollers ("AMM") [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) 418 606 546
Power Discrete Products ("PDP") [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) 18 139 179
Wireless [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) (885) (812) (483)
Reportable Segment [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) (474) 268 608
All Other Segments [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total consolidated operating income (loss) $ (1,607) [1] $ (222) [1] $ (132) [1]
[1] Operating loss of "Others" includes items such as impairment, restructuring charges and other related closure costs including ST-Ericsson plans, unused capacity charges, phase-out and start-up costs, the NXP arbitration award charge and other unallocated expenses such as: strategic or special research and development programs, certain corporate-level operating expenses and other costs that are not allocated to the product segments, as well as operating earnings of the Subsystems and Other Products Group.