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Long Term Debt and Related Contractual Rates and Maturity Dates (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨) | Mar. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Total |  | ₨ 932,906.3 | ₨ 730,920.7 | $ 14,328.2
Perpetual debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total |  | ₨ 79,997.3 |  |
Subordinated debt | Lower tier II capital | Fixed Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity /Call dates, start |  | 2019 | 2018 |
Maturity /Call dates, end |  | 2028 | 2027 |
Total |  | ₨ 124,264.8 | ₨ 121,215.9 | 1,908.5
Subordinated debt | Upper tier II capital | Fixed Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity /Call dates, start |  | 2019 | 2018 |
Maturity /Call dates, end |  | 2021 | 2021 |
Total |  | ₨ 26,798.7 | ₨ 27,797.7 | 411.6
Subordinated debt | Upper tier II capital | Perpetual debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity /Call dates, start |  | 2023 |  |
Maturity /Call dates, end |  | 2023 |  |
Total |  | ₨ 79,997.3 | ₨ 0.0 | $ 1,228.6
Subordinated debt | Minimum | Lower tier II capital | Fixed Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates |  | 7.56% | 6.00% | 7.56%
Subordinated debt | Minimum | Upper tier II capital | Fixed Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates |  | 8.70% | 8.70% | 8.70%
Subordinated debt | Minimum | Upper tier II capital | Perpetual debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates |  | 8.85% |  | 8.85%
Subordinated debt | Maximum | Lower tier II capital | Fixed Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates |  | 10.70% | 10.70% | 10.70%
Subordinated debt | Maximum | Upper tier II capital | Fixed Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates |  | 10.85% | 10.85% | 10.85%
Subordinated debt | Maximum | Upper tier II capital | Perpetual debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates |  | 8.85% |  | 8.85%
Others | Variable rate-(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity /Call dates, start | [1] | 2020 | 2018 |
Maturity /Call dates, end | [1] | 2022 | 2022 |
Total | [1] | ₨ 32,227.2 | ₨ 22,013.6 | $ 495.0
Others | Variable rate-(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity /Call dates, start | [1] | 2019 | 2018 |
Maturity /Call dates, end | [1] | 2023 | 2021 |
Total | [1] | ₨ 108,196.7 | ₨ 74,677.8 | 1,661.8
Others | Fixed rate-(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity /Call dates, start | [1] | 2019 | 2018 |
Maturity /Call dates, end | [1] | 2027 | 2027 |
Total | [1] | ₨ 561,421.6 | ₨ 444,930.8 | 8,622.7
Others | Fixed rate-(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity /Call dates, start | [1] |  | 2018 |
Maturity /Call dates, end | [1] |  | 2018 |
Total | [1] | ₨ 0.0 | ₨ 40,284.9 | $ 0.0
Others | Minimum | Variable rate-(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] | 2.68% | 2.20% | 2.68%
Others | Minimum | Variable rate-(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] | 7.64% | 8.00% | 7.64%
Others | Minimum | Fixed rate-(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] | 6.90% | 7.07% | 6.90%
Others | Minimum | Fixed rate-(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] |  | 1.62% |
Others | Maximum | Variable rate-(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] | 3.25% | 3.70% | 3.25%
Others | Maximum | Variable rate-(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] | 10.05% | 11.35% | 10.05%
Others | Maximum | Fixed rate-(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] | 10.35% | 10.35% | 10.35%
Others | Maximum | Fixed rate-(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | [1] |  | 4.30% |
[1] | Variable rate (1) and fixed rate (2) represent foreign currency debt

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