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Long-Term Debt - Scheduled Maturities of Long-Term Debt (Parenthetical) (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2023 INR (₨)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 INR (₨)
Debt Instrument [Line Items]
Long-term debt	₨ 2,054,436.4	$ 24,996.2	₨ 1,554,333.4
Perpetual debt
Debt Instrument [Line Items]
Long-term debt	₨ 125,575.1

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- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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