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Investments, Available for Sale Debt Securities -Summary of Allowances for Available for sale debt Securities (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | ₨ 2,915.1 | $ 38.4 | ₨ 0.0
Write- offs | 0.0 | 0.0 | 0.0
Net allowance for credit losses | (2,915.1) | (38.4) | 2,915.1
Allowance for credit losses, end of the period | 0.0 | $ 0.0 | 2,915.1
Debt securities, other than asset and mortgage0.0backed securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  |
Write- offs | 0.0 |  |
Net allowance for credit losses | 0.0 |  |
Allowance for credit losses, end of the period | 0.0 |  | 0.0
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  |
Write- offs | 0.0 |  |
Net allowance for credit losses | 0.0 |  |
Allowance for credit losses, end of the period | 0.0 |  | 0.0
Asset-backed securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  |
Write- offs | 0.0 |  |
Net allowance for credit losses | 0.0 |  |
Allowance for credit losses, end of the period | 0.0 |  | 0.0
Other securities (including mutual fund units) |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  |
Write- offs | 0.0 |  |
Net allowance for credit losses | 0.0 |  |
Allowance for credit losses, end of the period | 0.0 |  | 0.0
Government of India securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  |
Write- offs | 0.0 |  |
Net allowance for credit losses | 0.0 |  |
Allowance for credit losses, end of the period | 0.0 |  | 0.0
State government securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  |
Write- offs | 0.0 |  |
Net allowance for credit losses | 0.0 |  |
Allowance for credit losses, end of the period | 0.0 |  | 0.0
Credit Substitutes |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 2,915.1 |  | 0.0
Write- offs | 0.0 |  | 0.0
Net allowance for credit losses | (2,915.1) |  | 2,915.1
Allowance for credit losses, end of the period | 0.0 |  | 2,915.1
Other corporate/financial institution bonds |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  | 0.0
Write- offs | 0.0 |  | 0.0
Net allowance for credit losses | 0.0 |  | 0.0
Allowance for credit losses, end of the period | 0.0 |  | 0.0
Government securities outside India |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Allowance for credit losses, beginning of the period | 0.0 |  |
Write- offs | 0.0 |  |
Net allowance for credit losses | 0.0 |  |
Allowance for credit losses, end of the period | ₨ 0.0 |  | ₨ 0.0

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of writeoff of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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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. + Details
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