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Inventories - Schedule of Inventories (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Classes of current inventories [abstract]      
Stores and spare parts ₨ 613   ₨ 677
Finished and traded goods 1,252   3,274
Inventories ₨ 1,865 $ 25 ₨ 3,951