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Exposures to Ten Largest Borrowers Computed as per RBI Guidelines, Based on Higher of Outstanding Balance or Limit on Loans, Investments (Including Credit Substitutes) and Non-Funded Exposures (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)
Concentration Risk [Line Items]
Total Exposure	₨ 13,807,140.7	$ 188,776.9	₨ 12,210,922.2
Borrower 1
Concentration Risk [Line Items]
Total Exposure	303,418.5	4,148.5	244,582.8
Borrower 1 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	302,918.5		243,382.8
Borrower 1 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	500.0		1,200.0
Borrower 2
Concentration Risk [Line Items]
Total Exposure	253,526.4	3,466.3	180,405.1
Borrower 2 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	192,080.2		180,100.0
Borrower 2 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	61,446.2		305.1
Borrower 3
Concentration Risk [Line Items]
Total Exposure	195,480.0	2,672.7	164,349.6
Borrower 3 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	195,480.0		163,738.7
Borrower 3 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	0.0		610.9
Borrower 4
Concentration Risk [Line Items]
Total Exposure	155,545.9	2,126.7	149,853.6
Borrower 4 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	154,997.8		74,421.4
Borrower 4 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	548.1		75,432.2
Borrower 5
Concentration Risk [Line Items]
Total Exposure	150,489.2	2,057.5	135,455.0
Borrower 5 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	150,000.0		135,455.0
Borrower 5 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	489.2		0.0
Borrower 6
Concentration Risk [Line Items]
Total Exposure	148,107.3	2,025.0	87,586.0
Borrower 6 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	148,107.3		31,934.6
Borrower 6 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	0.0		55,651.4
Borrower 7
Concentration Risk [Line Items]
Total Exposure	104,308.5	1,426.1	78,583.2
Borrower 7 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	3,830.9		63,228.0
Borrower 7 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	100,477.6		15,355.2
Borrower 8
Concentration Risk [Line Items]
Total Exposure	100,919.7	1,379.8	75,257.5
Borrower 8 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	98,919.7		75,035.9
Borrower 8 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	2,000.0		221.6
Borrower 9
Concentration Risk [Line Items]
Total Exposure	97,706.2	1,335.9	75,210.5
Borrower 9 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	75,437.8		75,027.7
Borrower 9 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	22,268.4		182.8
Borrower 10
Concentration Risk [Line Items]
Total Exposure	90,108.0	$ 1,232.0	73,489.4
Borrower 10 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	90,108.0		51,361.3
Borrower 10 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	₨ 0.0		₨ 22,128.1

X

- Definition

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

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