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Trade Receivables - Schedule of Trade Receivables (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Trade and other receivables [abstract]        
Trade receivables ₨ 124,460   ₨ 119,686  
Allowance for lifetime expected credit loss (13,937)   (14,824) ₨ (14,570)
Total 110,523   104,862  
Non-current 6,049 $ 80 4,373  
Current ₨ 104,474 $ 1,386 ₨ 100,489