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Stockholders' Equity - Stock Options Outstanding (Details)
shares in Millions
12 Months Ended
Jan. 31, 2022
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Number Outstanding (in shares) | shares 21
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 8 months 12 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 156.34
Options Exercisable, Number of Shares (in shares) | shares 9
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 115.76
$0.71 to $80.99  
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) $ 80.99
Options, Number Outstanding (in shares) | shares 4
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 1 month 6 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 55.98
Options Exercisable, Number of Shares (in shares) | shares 3
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 57.00
$81.88 to $148.24  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 81.88
Range of Exercise Prices, Maximum (in dollars per share) $ 148.24
Options, Number Outstanding (in shares) | shares 3
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 8 months 12 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 125.80
Options Exercisable, Number of Shares (in shares) | shares 3
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 121.33
$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 4
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 1 month 6 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 154.14
Options Exercisable, Number of Shares (in shares) | shares 2
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 3
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 2 months 12 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 164.12
Options Exercisable, Number of Shares (in shares) | shares 1
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 162.61
$215.17 to $296.84  
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) $ 296.84
Options, Number Outstanding (in shares) | shares 7
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 2 months 12 days
Options Outstanding , Weighted-Average Exercise Price (in dollars per share) $ 223.61
Options Exercisable, Number of Shares (in shares) | shares 0
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 0.00