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.

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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

+ References

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Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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Balance Type:	credit
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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.

+ References

No definition available.

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Short-Term Borrowings (Detail) ₨ in Millions, $ in Millions	12 Months Ended
Short-Term Borrowings (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2018 USD ($)
Short-term Debt [Line Items]
Short-term borrowings	₨ 779,201.7		₨ 322,265.6	$ 11,967.5
Weighted average interest rate	4.90%		3.40%	4.90%
Maximum amount outstanding	₨ 865,997.0	$ 13,300.5	₨ 566,512.5
Average amount outstanding	512,626.7	$ 7,873.2	331,951.7
Borrowed in the call market
Short-term Debt [Line Items]
Short-term borrowings	28,585.7		21,202.2	$ 439.0
Term borrowings from institutions/banks
Short-term Debt [Line Items]
Short-term borrowings	391,950.0		127,400.0	6,019.8
Foreign currency borrowings
Short-term Debt [Line Items]
Short-term borrowings	307,066.6		₨ 173,663.4	4,716.1
Bills rediscounted
Short-term Debt [Line Items]
Short-term borrowings	₨ 51,599.4			$ 792.6