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Financial Instruments - Details of Guarantees and Documentary Credits Outstanding (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
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Guarantor Obligations [Line Items] |  |  |
Bank guarantees | ₨ 2,462,279.4 | $ 28,822.2 | ₨ 1,973,917.9
Estimated fair values of bank guarantees | (12,875.5) | (150.7) | (10,085.1)
Financial guarantees |  |  |
Guarantor Obligations [Line Items] |  |  |
Bank guarantees | 714,278.7 | 8,361.0 | 610,381.3
Performance guarantees |  |  |
Guarantor Obligations [Line Items] |  |  |
Bank guarantees | 781,152.1 | 9,143.8 | 653,452.8
Documentary credits |  |  |
Guarantor Obligations [Line Items] |  |  |
Bank guarantees | 966,848.6 | 11,317.4 | 710,083.8
Estimated fair values of bank guarantees | (1,462.5) | (17.1) | (1,018.9)
Guarantees [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Estimated fair values of bank guarantees | ₨ (11,413.0) | $ (133.6) | ₨ (9,066.2)

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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