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Gross Carrying Amount and Accumulated Amortization for Teradata Acquired Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount $ 251 $ 251
Accumulated Amortization (96) (68)
Currency Translation Adjustment 4 3
Intellectual property/developed technology
    
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount 153 153
Accumulated Amortization (66) (50)
Currency Translation Adjustment 2 2
Customer relationships
    
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount 77 77
Accumulated Amortization (22) (15)
Currency Translation Adjustment 2 1
Trademarks/trade names
    
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount 15 15
Accumulated Amortization (6) (2)
Currency Translation Adjustment 0 0
In-process research and development
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 5 years  
Gross Carrying Amount 5 5
Accumulated Amortization (1) 0
Currency Translation Adjustment 0 0
Non-compete agreements
    
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount 1 1
Accumulated Amortization (1) (1)
Currency Translation Adjustment $ 0 $ 0
Minimum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 1 year  
Minimum | Intellectual property/developed technology
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 1 year  
Minimum | Customer relationships
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 3 years  
Minimum | Trademarks/trade names
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 3 years 6 months  
Minimum | Non-compete agreements
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 1 year  
Maximum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 10 years  
Maximum | Intellectual property/developed technology
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 7 years  
Maximum | Customer relationships
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 10 years  
Maximum | Trademarks/trade names
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 5 years  
Maximum | Non-compete agreements
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 3 years