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Short-Term Borrowings (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)	Mar. 31, 2021 USD ($)
Short-term Debt [Line Items]
Short-term borrowings	₨ 239,264.1		₨ 377,417.6	$ 3,271.3
Weighted average interest rate	1.40%		3.20%	1.40%
Maximum amount outstanding	₨ 384,035.9	$ 5,250.7	₨ 971,364.0
Average amount outstanding	223,582.3	$ 3,056.9	493,786.9
Borrowed in the call market
Short-term Debt [Line Items]
Short-term borrowings	8,860.5		11,339.8	$ 121.1
Term borrowings from institutions/banks
Short-term Debt [Line Items]
Short-term borrowings	27,411.6		73,737.9	374.8
Foreign currency borrowings
Short-term Debt [Line Items]
Short-term borrowings	₨ 202,992.0		₨ 292,339.9	$ 2,775.4

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

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-Topic 210
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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

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