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Financial Instruments - Summary of Significant Unobservable Inputs to Valuation (Parenthetical) (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2018	Mar. 31, 2017
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [Abstract]
Unquoted equity investments	₨ 1,545	₨ 3,232

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- Definition

Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities abstract.

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Unquoted equity investments

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