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Credit substitutes (Tables) | 12 Months Ended
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Mar. 31, 2018
Credit substitutes by bank's internal credit quality indicators | The fair values of credit substitutes by the Bank’s internal credit quality indicators and amounts provided for other than temporary impairments is as follows:
|  | As of March 31, |
|  | 2017 |  |  | 2018 |  |  | 2018 |
|  | (In millions) |
Pass |  | Rs. | 419,540.6 |  |  | Rs. | 324,031.5 |  |  | US$ | 4,976.7 |
Impaired—gross balance |  |  | — |  |  |  | — |  |  |  | — |
Less: amounts provided for other than temporary impairments |  |  | — |  |  |  | — |  |  |  | — |
Impaired credit substitutes, net |  |  | — |  |  |  | — |  |  |  | — |
Total credit substitutes, net |  | Rs. | 419,540.6 |  |  | Rs. | 324,031.5 |  |  | US$ | 4,976.7 |
Impaired credit substitutes | Impaired credit substitutes
|  | As of March 31, |
|  | 2017 |  |  | 2018 |  |  | 2018 |
|  | (In millions) |
Gross impaired credit substitutes |  |  | Rs.— |  |  |  | Rs.— |  |  | US$ | — |
Gross impaired credit substitutes by industry |  |  | Rs.— |  |  |  | Rs.— |  |  | US$ | — |
Average impaired credit substitutes |  |  | Rs.— |  |  |  | Rs.— |  |  | US$ | — |
Interest income recognized on impaired credit substitutes |  |  | Rs.— |  |  |  | Rs.— |  |  | US$ | — |

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- Definition Credit Substitutes by Credit Quality Indicators [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | hdb_
Data Type: | nonnum:textBlockItemType
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- Definition Impaired Credit Substitutes [Table Text Block] + References No definition available. + Details
Name: | hdb_ImpairedCreditSubstitutesTableTextBlock
Namespace Prefix: | hdb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration