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Investment in equity accounted investees (Details)
₨ in Millions, $ in Millions
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Mar. 31, 2020
INR (₨)
Investments accounted for using equity method [Line Items]        
Investments accounted for using equity method ₨ 4,318 $ 57 ₨ 3,375  
Kunshan Rotam Reddy Pharmaceuticals Co. Limited [Member]        
Investments accounted for using equity method [Line Items]        
Investments accounted for using equity method [1] 4,259   3,307 ₨ 2,714
DRES energy private limited [Member]        
Investments accounted for using equity method [Line Items]        
Investments accounted for using equity method ₨ 59   ₨ 68 ₨ 49
[1] Includes Rs.181 representing the goodwill on acquisition of investment.