Expenses by Nature - Summary of Expenses by Nature (Parenthetical) (Detail) - INR (₨) ₨ in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Disclosure Of Expense [line items]
Impairment charge on intangible assets	₨ 1,701	₨ 1,816	₨ 0
Gain on sale of immovable properties	₨ (2,357)

The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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