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Gross Carrying Amount and Accumulated Amortization for Teradata's Acquired Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Acquired Finite-Lived Intangible Assets    
Accumulated Amortization and Currency Translation Adjustments $ (65) $ (31)
Gross Carrying Amount 251 194
Minimum
    
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  
Intellectual Property/Developed Technology
    
Acquired Finite-Lived Intangible Assets    
Accumulated Amortization and Currency Translation Adjustments (48) (23)
Gross Carrying Amount 153 122
Intellectual Property/Developed Technology | Minimum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 1 year  
Intellectual Property/Developed Technology | Maximum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 7 years  
Customer Relationships
    
Acquired Finite-Lived Intangible Assets    
Accumulated Amortization and Currency Translation Adjustments (14) (6)
Gross Carrying Amount 77 55
Customer Relationships | Minimum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 3 years  
Customer Relationships | Maximum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 10 years  
Trademarks/Trade names
    
Acquired Finite-Lived Intangible Assets    
Accumulated Amortization and Currency Translation Adjustments (2) (1)
Gross Carrying Amount 15 11
Trademarks/Trade names | Minimum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 5 years  
Trademarks/Trade names | Maximum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 10 years  
In-Process Research And Development
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 5 years  
Accumulated Amortization and Currency Translation Adjustments 0 0
Gross Carrying Amount 5 5
Non-compete Agreements
    
Acquired Finite-Lived Intangible Assets    
Accumulated Amortization and Currency Translation Adjustments (1) (1)
Gross Carrying Amount $ 1 $ 1
Non-compete Agreements | Minimum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 2 years  
Non-compete Agreements | Maximum
    
Acquired Finite-Lived Intangible Assets    
Original Amortization Life (in Years) 2 years 6 months