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Trade Receivables - Schedule of Trade Receivables (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Trade and other receivables [abstract]        
Trade receivables ₨ 119,686   ₨ 121,413  
Allowance for lifetime expected credit loss (14,824)   (14,570) ₨ (9,108)
Assets reclassified as held for sale     (1,407)  
Total 104,862   105,436  
Non-current 4,373 $ 63 4,446  
Current 100,489 $ 1,453 100,990  
Total ₨ 104,862   ₨ 105,436