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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Mar. 31, 2018
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, 2017 and March 31, 2018:
|  | As of March 31, 2017 |  |  | As of March 31, 2018 |
|  | 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. | — |  |  | Rs. | 8,335.0 |  |  | Rs. | 8,335.0 |  |  | Rs. | — |  |  | US$ | — |
Customer list |  |  | 2,710.0 |  |  |  | 2,710.0 |  |  |  | — |  |  |  | 2,710.0 |  |  |  | 2,710.0 |  |  |  | — |  |  |  | — |
Core deposit |  |  | 4,414.0 |  |  |  | 4,414.0 |  |  |  | — |  |  |  | 4,414.0 |  |  |  | 4,414.0 |  |  |  | — |  |  |  | — |
Favorable leases |  |  | 543.0 |  |  |  | 541.0 |  |  |  | 2.0 |  |  |  | 543.0 |  |  |  | 542.0 |  |  |  | 1.0 |  |  |  | — |
Total |  | Rs. | 16,002.0 |  |  | Rs. | 16,000.0 |  |  | Rs. | 2.0 |  |  | Rs. | 16,002.0 |  |  | Rs. | 16,001.0 |  |  | Rs. | 1.0 |  |  | US$ | — |
Schedule of Expected Amortization Expense | The estimated amortization expense for intangible assets for each of the five succeeding twelve months period is given in the table below:
|  | As of March 31, |
|  | 2018 |  |  | 2018 |
|  | (In millions) |
To be amortized during the twelve months ending March 31: |  |  |  |  |  |  |  |
2019 |  | Rs. | 1.0 |  |  | US$ | — |
2020 |  |  | — |  |  |  | — |
2021 |  |  | — |  |  |  | — |
2022 |  |  | — |  |  |  | — |
2023 |  |  | — |  |  |  | — |

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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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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