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Deposits - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨)
Deposits From Banking Clients [Line Items] |  |  |
Time deposits with residual maturity of one year or less | ₨ 5,901,654.6 | $ 80,689.8 | ₨ 5,233,225.0
Time deposits | ₨ 7,191,543.0 | $ 98,325.8 | 6,626,711.8
Minimum [Member] |  |  |
Deposits From Banking Clients [Line Items] |  |  |
Maturity of deposits | 1 year |  |
Maximum [Member] |  |  |
Deposits From Banking Clients [Line Items] |  |  |
Maturity of deposits | 10 years |  |
Deposit in excess of Rs. 100000 |  |  |
Deposits From Banking Clients [Line Items] |  |  |
Time deposits | ₨ 6,969,220.2 |  | ₨ 6,397,698.1

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- Definition Deposits From Banking Clients [Line Items] + References No definition available. + Details
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- Definition Period of time between issuance and maturity of customer deposits, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
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- Definition Amount of time deposit maturing in next fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposit liabilities, including certificates of deposit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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