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Financial Instruments - Summary of Financial Assets and Liabilities (Parenthetical) (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2019
Mar. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Unbilled receivables ₨ 22,880 ₨ 42,486
Fixed-price contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Unbilled receivables ₨ 15,038