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Dividends, Bonus and Buy Back of equity shares - Additional Information (Detail)
₨ / shares in Units, ₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
₨ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
₨ / shares
Mar. 08, 2019
INR (₨)
₨ / shares
shares
Mar. 31, 2018
INR (₨)
₨ / shares
shares
Jun. 15, 2017
INR (₨)
₨ / shares
shares
Disclosure of dividends [line items]            
Cash dividends paid per equity share | ₨ / shares ₨ 1   ₨ 1   ₨ 1  
Interim dividend ₨ 1   ₨ 1   ₨ 1  
Bonus issue ratio       33.33%   100.00%
Par value per share | ₨ / shares ₨ 2   ₨ 2 ₨ 2 ₨ 2 ₨ 2
Bonus issue of equity shares | 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 | shares 323,076,923       343,750,000  
Payments on buyback of shares ₨ 105,000       ₨ 110,000  
Payments on buyback of shares 105,311 $ 1,397     110,312  
Reduction in share capital related to buyback 646       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  
Payments on buyback of shares 105,000          
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  
Payments on buyback of shares 105,000          
Capital Redemption Reserve [member]            
Disclosure of dividends [line items]            
Payments on buyback of shares ₨ 646       ₨ 687  
[1] Refer to Note 22