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Trade Receivables - Summary of Allowance for Credit Loss (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of financial assets [abstract]    
Balance at the beginning of the year ₨ 14,570 ₨ 9,108
Additions during the year, net (Refer Note 21) 980 5,456
Uncollectable receivables Charged against allowance (772) (29)
Translation adjustment 46 35
Balance at the end of the year ₨ 14,824 ₨ 14,570