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Stockholders' Equity - Stock Options Outstanding (Details)
shares in Millions
9 Months Ended
Oct. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Number Outstanding (in shares) | shares 23
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 10 months 24 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 152.07
Options Exercisable, Number of Shares (in shares) | shares 9
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 109.41
$0.71 to $75.57  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 0.71
Range of Exercise Prices, Maximum (in dollars per share) $ 75.57
Options, Number Outstanding (in shares) | shares 3
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 45.45
Options Exercisable, Number of Shares (in shares) | shares 3
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 44.55
$76.48 to $122.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 76.48
Range of Exercise Prices, Maximum (in dollars per share) $ 122.82
Options, Number Outstanding (in shares) | shares 3
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 8 months 12 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 106.84
Options Exercisable, Number of Shares (in shares) | shares 3
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 105.27
$122.91 to $148.95  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 122.91
Range of Exercise Prices, Maximum (in dollars per share) $ 148.95
Options, Number Outstanding (in shares) | shares 1
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 2 months 12 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 141.48
Options Exercisable, Number of Shares (in shares) | shares 0
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 140.22
$154.14  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 154.14
Range of Exercise Prices, Maximum (in dollars per share) $ 154.14
Options, Number Outstanding (in shares) | shares 5
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 3 months 18 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 154.14
Options Exercisable, Number of Shares (in shares) | shares 1
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 154.14
$155.20 to $207.53  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 155.20
Range of Exercise Prices, Maximum (in dollars per share) $ 207.53
Options, Number Outstanding (in shares) | shares 4
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 3 months 18 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 164.36
Options Exercisable, Number of Shares (in shares) | shares 2
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 162.98
$215.17 to $292.56  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 215.17
Range of Exercise Prices, Maximum (in dollars per share) $ 292.56
Options, Number Outstanding (in shares) | shares 7
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 4 months 24 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 221.70
Options Exercisable, Number of Shares (in shares) | shares 0
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 248.80