Financial instruments (Details Textual) - INR (₨) ₨ in Millions	Mar. 31, 2026	Mar. 31, 2025
Financial instruments [Line Items]
Other non-financial assets	₨ 30,215	₨ 27,162
Other non-financial liabilities	17,239	18,195
Derivative financial assets	155	557
Derivative financial liabilities	6,898	1,286
Current financial liabilities at amortised cost	43,792	34,001
Consideration transferred, acquisition-date fair value	220	2,916
Component of Equity before tax adjustment [member]
Financial instruments [Line Items]
Reserve of cash flow hedges	₨ 143	₨ 1,555

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Total for all business combinations [member]]

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The amount of current financial liabilities measured at amortised cost. [Refer: Financial liabilities at amortised cost]

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of non-financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

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The amount of non-financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Other financial liabilities]

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A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

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