Cash and Cash Equivalents - Summary of Cash and Cash Equivalents for the Purpose of the Consolidated Cash Flow Statement (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2025 INR (₨)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 INR (₨)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 INR (₨)	Mar. 31, 2022 INR (₨)
Cash and cash equivalents [abstract]
Cash and cash equivalents	₨ 121,974	$ 1,428	₨ 96,953		₨ 91,880
Bank overdrafts			(2)		(19)
Total	₨ 121,974	$ 1,428	₨ 96,951	$ 1,135	₨ 91,861	₨ 103,833

The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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The amount of cash and cash equivalents in the statement of cash flows when different from the amount of cash and cash equivalents in the statement of financial position. [Refer: Cash and cash equivalents]

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