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Property, Plant and Equipment - Disclosure of Summary about Property, Plant and Equipment (Parenthetical) (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Mar. 31, 2019
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Net carrying value ₨ 70,601 ₨ 64,443   $ 1,021
Computer equipment and software [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net carrying value 16,375 17,765    
Software platform [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment charges ₨ 1,480 ₨ 0 ₨ 0