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Investments in Affiliates (Parenthetical) (Detail)	Mar. 31, 2019
Computer Age Management Services Private Limited (''CAMS'')
Investments in and Advances to Affiliates [Line Items]
HDFC Bank Ltd. and subsidiaries Investment	6.50%
Computer Age Management Services Private Limited (''CAMS'') | HDFC Group Ownership
Investments in and Advances to Affiliates [Line Items]
HDFC Bank Ltd. and subsidiaries Investment	12.50%
International Asset Reconstruction Company Private Limited
Investments in and Advances to Affiliates [Line Items]
HDFC Bank Ltd. and subsidiaries Investment	19.20%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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+ References

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