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Employee Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Employee Stock Purchase Program
Dec. 31, 2011
Employee Stock Purchase Program
Dec. 31, 2010
Employee Stock Purchase Program
Jan. 31, 2013
Employee Stock Purchase Program
Subsequent Event
Dec. 31, 2012
Stock Option
Dec. 31, 2011
Stock Option
Dec. 31, 2010
Stock Option
Dec. 31, 2012
Service-Based Awards
Minimum
Dec. 31, 2012
Service-Based Awards
Maximum
Dec. 31, 2012
Performance Based Awards
Minimum
Dec. 31, 2012
Performance Based Awards
Maximum
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2010
Restricted Stock
Dec. 31, 2012
Restricted Stock Units With Market Based Performance Criteria
Dec. 31, 2012
Restricted Stock Units With Market Based Performance Criteria
Minimum
Dec. 31, 2012
Restricted Stock Units With Market Based Performance Criteria
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Shares authorized to be issued under the Teradata SIP 16,400,000                                      
Weighted-average fair value of options granted for Teradata equity awards               $ 22.31 $ 18.12 $ 13.97                    
Risk-free interest rate within the contractual life of the option               The risk-free interest rate for periods within the contractual life of the option is based on an average of the five-year and seven-year                        
Total intrinsic value of options exercised               $ 113,000,000 $ 38,000,000 $ 34,000,000                    
Cash received by the Company from option exercises under all share-based payment arrangements               43,000,000 16,000,000 25,000,000                    
Tax benefit realized from stock options exercises               38,000,000 14,000,000 9,000,000                    
Total unrecognized compensation cost related to unvested stock grants               34,000,000             81,000,000          
Cost expected to be recognized over a weighted-average period (in years)               3 years             2 years 9 months 18 days          
Vesting period(in years)                     3 years 4 years 1 year 4 years            
Weighted-average fair value of restricted stock unit awards granted $ 60.71 $ 45.19 $ 34.32                             $ 26.78    
Total fair value of shares vested                             15,000,000 11,000,000 14,000,000      
Restricted stock unit awards granted 1,101,000                                 300,000    
Number of equally-weighted financial performance metrics                                   2    
Payout range for market based performance restricted stock unit awards                                     50.00% 200.00%
Compensation expense for restricted stock awards 28,000,000 21,000,000 14,000,000                             0    
Employee stock purchase program discount from average market price       5.00%     15.00%                          
Percentage of authorized payroll deductions for common stock purchases by employees       10.00%                                
Shares authorized to be issued under the Employee Stock Purchase Program       4,000,000                                
Remaining shares authorized to be issued under the Employee Stock Purchase Program       2,800,000                                
Employee purchased shares       200,000 200,000 200,000                            
Employee purchased shares estimated cost       $ 12,000,000 $ 9,000,000 $ 7,000,000