v3.26.1
Dividends, Bonus issue and Buyback of equity shares - Additional Information (Detail)
₨ / shares in Units, ₨ in Millions, $ in Millions
12 Months Ended
Jan. 16, 2026
₨ / shares
Jul. 17, 2025
₨ / shares
Dec. 03, 2024
INR (₨)
₨ / shares
shares
Mar. 31, 2026
INR (₨)
₨ / shares
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
₨ / shares
Mar. 31, 2024
INR (₨)
₨ / shares
shares
Dec. 04, 2024
shares
Disclosure of dividends [line items]                
Cash dividends paid per equity share | ₨ / shares ₨ 6 ₨ 5   ₨ 11   ₨ 6 ₨ 1  
Number of shares approved for buyback | shares             269,662,921  
Buy back shares per share | ₨ / shares             ₨ 445  
Total cash outflow on buyback of shares             ₨ 145,173  
Payments on buyback of shares       ₨ 0 $ 0 ₨ 0 145,173  
Reduction in share capital related to buyback             539  
Tax on Buyback of Shares             24,783  
Transaction costs related to buyback             ₨ 390  
Bonus Issued Ratio     100.00%     100.00% 100.00%  
Par value per share | ₨ / shares     ₨ 2     ₨ 2 ₨ 2  
Alloted shares | shares     1,274,805         5,232,094,402
Transferred from capital redemption reserves, securities premium and retained earnings to the share capital     ₨ 10,467     ₨ 0 [1]    
Securities premium reserve [member]                
Disclosure of dividends [line items]                
Payments on buyback of shares             ₨ 3,768  
Transferred from capital redemption reserves, securities premium and retained earnings to the share capital [1]           (5,613)    
Retained earnings [member]                
Disclosure of dividends [line items]                
Payments on buyback of shares             141,405  
Transferred from capital redemption reserves, securities premium and retained earnings to the share capital [1]           (3,193)    
Capital Redemption Reserve [Member]                
Disclosure of dividends [line items]                
Nominal value of buyback in capital redemption reserve             ₨ 539  
Transferred from capital redemption reserves, securities premium and retained earnings to the share capital           ₨ (1,661)    
[1] Refer to Note 22