Cash and cash equivalents (Details) ₨ in Millions, $ in Millions	Mar. 31, 2026 INR (₨)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 INR (₨)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 INR (₨)	Mar. 31, 2023 INR (₨)
Current
Bank deposits held under lien against borrowings / guarantees from banks / Government authorities	₨ 974		₨ 454		₨ 440
Total restricted cash	974	$ 10	454		440
Current
Cash and cash equivalents	4,098	43	4,997		4,106
Other bank deposits (maturity period more than 3 months)	0	0	1,307		1,289
Total Non restricted cash	4,098		6,304		5,395
Total cash (a+b)	5,072		6,758		5,835
Bank overdraft used for cash management purposes	0	0	(326)		(487)
Bank deposits held under lien against borrowings / guarantees from banks / Government authorities	(974)		(454)		(440)
Other bank deposits (maturity period more than 3 months)	0		1,307		1,289
Cash and cash equivalents for the statement of cash flows	₨ 4,098	$ 42	₨ 4,671	$ 49	₨ 3,619	₨ 2,699

The amount that has been withdrawn from an account in excess of existing cash balances.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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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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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The amount of current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of current assets that the entity does not separately disclose in the same statement or note. [Refer: Current assets]

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The amount of differences between cash and cash equivalents in the statement of cash flows and the statement of financial position that the entity does not separately disclose in the same statement or note. [Refer: Cash and cash equivalents]

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The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

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The summation of restricted and non-restricted amount of cash .

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Non restricted cash and cash equivalents.

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