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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Mar. 31, 2019
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination | The table below presents the gross carrying amount, accumulated amortization and net carrying amount, in total and by class of intangible assets as of March 31, 2018 and March 31, 2019:
|  | As of March 31, 2018 |  |  | As of March 31, 2019 |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying amount |  |  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying amount |  |  | Net carrying amount |
|  |  |  |  |  |  |  |  |  |  | (In millions) |  |  |  |  |  |  |  |  |  |
Branch network |  | Rs. | 8,335.0 |  |  | Rs. | 8,335.0 |  |  | Rs. | 0.0 |  |  | Rs. | 8,335.0 |  |  | Rs. | 8,335.0 |  |  | Rs. | 0.0 |  |  | US$ | 0.0 |
Customer list |  |  | 2,710.0 |  |  |  | 2,710.0 |  |  |  | 0.0 |  |  |  | 2,710.0 |  |  |  | 2,710.0 |  |  |  | 0.0 |  |  |  | 0.0 |
Core deposit |  |  | 4,414.0 |  |  |  | 4,414.0 |  |  |  | 0.0 |  |  |  | 4,414.0 |  |  |  | 4,414.0 |  |  |  | 0.0 |  |  |  | 0.0 |
Favorable leases |  |  | 543.0 |  |  |  | 542.0 |  |  |  | 1.0 |  |  |  | 543.0 |  |  |  | 543.0 |  |  |  | 0.0 |  |  |  | 0.0 |
Total |  | Rs. | 16,002.0 |  |  | Rs. | 16,001.0 |  |  | Rs. | 1.0 |  |  | Rs. | 16,002.0 |  |  | Rs. | 16,002.0 |  |  | Rs. | 0.0 |  |  | US$ | 0.0 |

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- Definition Tabular disclosure of finite-lived intangible assets acquired as part of a business combination or through an asset purchase, by major class and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration