v3.26.1
Share-Based Compensation (RSUs Activity) (Details) - RSUs [Member]
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2026
₨ / shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2025
₨ / shares
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2024
₨ / shares
Mar. 31, 2024
USD ($)
shares
Number of RSUs            
Outstanding, beginning of period (shares) | shares   5,829,708        
Granted (shares) | shares   1,788,716   1,714,753   1,975,035
Exercised (shares) | shares   (3,979,864)        
Forteited/Cancelled (shares) | shares   (321,174)        
Outstanding, end of period (shares) | shares   3,317,386   5,829,708    
Grant Date Fair Value            
Outstanding, beginning of period (Indian Rupees per share) | ₨ / shares ₨ 490.15          
Granted (Indian Rupees per share) | ₨ / shares 635.78   ₨ 681.40   ₨ 417.90  
Exercised (Indian Rupees per share) | ₨ / shares 442.56          
Forfeited/Cancelled (Indian Rupees per share) | ₨ / shares 600.30          
Outstanding, end of period (Indian Rupees per share) | ₨ / shares ₨ 615.40   ₨ 490.15      
Aggregate Intrinsic Value            
Outstanding, end of period | $   $ 50        
Granted | $   17        
Exercised | $   $ 32   $ 15   $ 13
Forfeited/Cancelled | $ / shares   $ 0        
Outstanding, beginning of period | $   $ 34   $ 50