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Convertible Senior Notes, Net - Narrative (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Jan. 31, 2025
USD ($)
tradingDay
$ / shares
shares
Jan. 31, 2024
USD ($)
shares
Jan. 31, 2023
USD ($)
shares
Mar. 01, 2020
Debt Instrument [Line Items]        
Gain on early extinguishment of debt | $ $ 19 $ 106 $ 0  
Antidilutive securities excluded from computation of earnings per share (in shares) | shares 8,673 20,652 28,819  
Convertible senior notes        
Debt Instrument [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) | shares 4,170 5,473 11,485  
Senior Notes        
Debt Instrument [Line Items]        
Gain on early extinguishment of debt | $ $ 19 $ 106    
2025 Notes        
Debt Instrument [Line Items]        
Initial cap price (in dollars per share) | $ / shares $ 255.88      
2025 Notes | Convertible senior notes        
Debt Instrument [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) | shares 6,000      
2025 Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt repurchased, principal amount | $ $ 42 508    
Repayments of debt | $ $ 40 462    
Fixed interest rate       0.125%
Initial conversion rate of common stock 0.0052991      
Conversion price (in dollars per share) | $ / shares $ 188.71      
Limit within threshold of consecutive trading days | tradingDay 20      
Limitation on sale of common stock, sale price threshold, trading period | tradingDay 30      
Sales price as a percentage of conversion price 130.00%      
Number of consecutive business days | tradingDay 5      
Percentage of closing sale price in excess of convertible notes 98.00%      
Redemption price percentage 100.00%      
2026 Notes        
Debt Instrument [Line Items]        
Redemption price percentage 130.00%      
Initial cap price (in dollars per share) | $ / shares $ 360.14      
2026 Notes | Convertible senior notes        
Debt Instrument [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) | shares 5,000      
2026 Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt repurchased, principal amount | $ $ 258 542    
Repayments of debt | $ $ 240 $ 475    
Fixed interest rate 0.375%      
Initial conversion rate of common stock 0.0041912      
Conversion price (in dollars per share) | $ / shares $ 238.60      
Limit within threshold of consecutive trading days | tradingDay 20      
Limitation on sale of common stock, sale price threshold, trading period | tradingDay 30      
Sales price as a percentage of conversion price 130.00%      
Number of consecutive business days | tradingDay 5      
Percentage of closing sale price in excess of convertible notes 98.00%      
Redemption price percentage 100.00%