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Employee Stock-based Compensation Plans - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Mar. 01, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 01, 2013
Long-Term Strategic PBRSUs
Jan. 31, 2013
Employee Stock Purchase Program
Dec. 31, 2013
Employee Stock Purchase Program
Dec. 31, 2012
Employee Stock Purchase Program
Dec. 31, 2011
Employee Stock Purchase Program
Dec. 31, 2013
Stock Option
Dec. 31, 2012
Stock Option
Dec. 31, 2011
Stock Option
Dec. 31, 2013
Restricted Stock
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2013
Restricted Stock Units With Market Based Performance Criteria
Dec. 31, 2012
Restricted Stock Units With Market Based Performance Criteria
Dec. 31, 2013
Service-Based Awards
Minimum
Dec. 31, 2013
Service-Based Awards
Maximum
Dec. 31, 2013
Performance Based Awards
Minimum
Dec. 31, 2013
Performance Based Awards
Maximum
Dec. 31, 2013
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares authorized to be issued under the Teradata SIP   16,400,000                                        
Stock option, term                                           10 years
Vesting period(in years)                                   3 years 4 years 1 year 4 years 4 years
Weighted-average fair value of options granted for Teradata equity awards                   $ 18.02 $ 22.31 $ 18.12                    
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                   $ 19,000,000 $ 113,000,000 $ 38,000,000                    
Cash received by the Company from option exercises under all share-based payment arrangements                   9,000,000 43,000,000 16,000,000                    
Tax benefit realized from stock options exercises                   6,000,000 38,000,000 14,000,000                    
Total unrecognized compensation cost related to unvested stock grants                   36,000,000     68,000,000                  
Cost expected to be recognized over a weighted-average period (in years)                   3 years 1 month 6 days     2 years 4 months 24 days                  
Weighted-average fair value of restricted stock unit awards granted   $ 48.24 $ 60.71 $ 45.19                       $ 26.78            
Total fair value of shares vested                         30,000,000 15,000,000 11,000,000              
Restricted stock unit awards granted   995,000                             300,000          
Number of types of market based performance awards 2                                          
Performance based restricted units percentage of total units allocated 70.00%       30.00%                                  
Compensation expense for restricted stock awards   32,000,000 28,000,000 21,000,000                       0            
Employee stock purchase program discount from average market price           15.00%   5.00%                            
Percentage of authorized payroll deductions for common stock purchases by employees             10.00% 10.00% 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             2,400,000                              
Employee purchased shares             400,000 200,000 200,000                          
Employee purchased shares estimated cost             $ 20,000,000 $ 12,000,000 $ 9,000,000