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Fair Values of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 2,072,759.4 | $ 31,962.3 | ₨ 1,862,550.9
Fair Value | 2,111,385.6 | 32,558.0 | 1,878,684.4
Debt securities, other than asset and mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,049,111.1 |  | 1,841,714.5
Fair Value | 2,087,324.6 | 32,187.0 | 1,857,625.1
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 419,320.5 | 6,466.0 | 297,154.7
Fair Value | 419,540.6 | $ 6,469.4 | 297,241.0
Debt securities, other than asset and mortgage-backed securities | Debentures | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 171,180.6 |  | 39,028.0
Fair Value | 171,270.9 |  | 39,234.6
Debt securities, other than asset and mortgage-backed securities | Commercial paper | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 248,139.9 |  | 258,126.7
Fair Value | ₨ 248,269.7 |  | ₨ 258,006.4

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