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Gross Carrying Amount, Accumulated Amortization and Net Carrying Amount, in Total and by Major Class of Intangible Assets (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
--- | --- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | ₨ 16,002.0 |  | ₨ 16,002.0
Accumulated amortization | 16,000.0 |  | 15,997.0
Net carrying amount | 2.0 | $ 0.0 | 5.0
Branch network |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 8,335.0 |  | 8,335.0
Accumulated amortization | 8,335.0 |  | 8,335.0
Net carrying amount | 0.0 | 0.0 | 0.0
Customer list |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 2,710.0 |  | 2,710.0
Accumulated amortization | 2,710.0 |  | 2,710.0
Net carrying amount | 0.0 | 0.0 | 0.0
Core deposit |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 4,414.0 |  | 4,414.0
Accumulated amortization | 4,414.0 |  | 4,414.0
Net carrying amount | 0.0 | 0.0 | 0.0
Favorable leases |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 543.0 |  | 543.0
Accumulated amortization | 541.0 |  | 538.0
Net carrying amount | ₨ 2.0 | $ 0.0 | ₨ 5.0

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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