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Inventories - Schedule of Inventories (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Classes of current inventories [abstract]      
Stores and spare parts ₨ 677   ₨ 769
Finished goods and traded goods 3,274   2,601
Inventories ₨ 3,951 $ 57 ₨ 3,370