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Trade Receivables - Summary of Allowance for Credit Loss (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of financial assets [abstract]    
Balance at the beginning of the year ₨ 9,108 ₨ 8,709
Additions during the year, net 5,456 2,427
Uncollectable receivables Charged against allowance (29) (2,099)
Translation adjustment 35 71
Balance at the end of the year ₨ 14,570 ₨ 9,108