v3.26.1
Convertible unsecured senior notes - General (Details)
$ / shares in Units, ¥ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
shares
May 31, 2024
USD ($)
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2026
CNY (¥)
Mar. 31, 2025
USD ($)
Mar. 31, 2025
CNY (¥)
Debt Instrument [Line Items]            
Convertible senior notes outstanding rate for redemption rights     10.00% 10.00%    
2024 Convertible Senior Notes            
Debt Instrument [Line Items]            
Principal amount | $   $ 5,000,000,000        
Debt Instrument, interest rate terms     The 2024 Convertible Senior Notes are senior unsecured obligations, and interest at an annual rate of 0.5% is payable in arrears semiannually.      
Interest rate   0.50%        
Debt conversion, shares | shares   9.5202 9.8915      
Debt conversion, principal amount | $   $ 1,000 $ 1,000      
Percentage of ADS price threshold for convertible bonds redemption     130.00%      
Unamortized debt discounts and debt issuance costs | ¥       ¥ 308   ¥ 424
Fair value     $ 6,929,000,000 ¥ 47,869 $ 7,151,000,000 ¥ 51,854
Effective interest rate     0.08% 0.08% 0.08% 0.08%
Purchase of capped call transactions     $ 638,000,000 ¥ 4,612    
Debt instrument, capped call transactions, initial cap price (in dollars per share) | $ / shares     $ 161.6      
2024 Convertible Senior Notes | Maximum            
Debt Instrument [Line Items]            
Debt conversion, shares | shares   12.3762 12.8589      
2025 Convertible Senior Notes            
Debt Instrument [Line Items]            
Principal amount | $ $ 3,200,000,000          
Debt conversion, shares | shares 5.1773          
Debt conversion, principal amount | $ $ 1,000   $ 1,000      
Unamortized debt discounts and debt issuance costs | ¥       258    
Fair value     $ 3,047,000,000 ¥ 21,050    
Effective interest rate     0.03% 0.03%    
Purchase of capped call transactions     $ 184,000,000 ¥ 1,309    
Debt instrument, capped call transactions, initial cap price (in dollars per share) | $ / shares     $ 235.46      
2025 Convertible Senior Notes | Maximum            
Debt Instrument [Line Items]            
Debt conversion, shares | shares   6.7953