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Trade Receivables - Summary of Allowance for Credit Loss (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of financial assets [abstract]    
Balance at the beginning of the year ₨ 14,824 ₨ 14,570
Additions during the year, net (Refer to Note 25) 1,043 980
Uncollectable receivables Charged against allowance (2,139) (772)
Translation adjustment 209 46
Balance at the end of the year ₨ 13,937 ₨ 14,824