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Consolidated Statement of Changes in Equity (Parenthetical) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Shares transferred for exercise option 4,351,775
Foreign currency translation reserve associated with assets held for sale ₨ 2,907    
Foreign currency translation reserve [member]      
Foreign currency translation reserve associated with assets held for sale ₨ 2,907    
Treasury shares [member]      
Treasury shares held 23,097,216 13,728,607 14,829,824