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Dividends, Bonus and Buy Back of equity shares - Additional Information (Detail) - INR (₨)
₨ / shares in Units, ₨ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 08, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of dividends [line items]        
Cash dividends paid per equity share ₨ 1   ₨ 1 ₨ 3
Interim dividend ₨ 1   ₨ 1 ₨ 2
Bonus issue ratio   33.33% 100.00%  
Par value per share   ₨ 2 ₨ 2 ₨ 2
Bonus issue of equity shares   1,508,469,180 2,433,074,327  
Bonus issue of equity shares, shares   ₨ 3,016 ₨ 4,866  
Number of shares approved for buyback     343,750,000  
Payments on buyback of shares     ₨ 110,000  
Payments on buyback of shares     110,312 ₨ 25,000
Reduction in share capital related to buyback     687  
Securities premium reserve [member]        
Disclosure of dividends [line items]        
Bonus issue of equity shares, shares [1] (795)      
Payments on buyback of shares     1,656  
Retained earnings [member]        
Disclosure of dividends [line items]        
Bonus issue of equity shares, shares ₨ (1,454) [1]   (4,866)  
Payments on buyback of shares     108,344  
Capital Redemption Reserve [member]        
Disclosure of dividends [line items]        
Payments on buyback of shares     ₨ 687  
[1] Refer Note 18