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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents for the Purpose of Cash Flow Statement (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019 INR (₨)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2016 INR (₨)
Cash and cash equivalents [abstract]
Cash and cash equivalents (as above)	₨ 158,529	$ 2,292	₨ 44,925		₨ 52,710
Bank overdrafts	(4)		(3,999)		(1,992)
Total	₨ 158,525	$ 2,291	₨ 40,926	$ 592	₨ 50,718	₨ 98,392

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- Definition

The amount that has been withdrawn from an account in excess of existing cash balances.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]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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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- Definition

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]

+ References

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