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Fair Values of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 1,862,550.9 | $ 28,114.0 | ₨ 1,489,085.4
Fair Value | 1,878,684.4 | 28,357.5 | 1,504,412.8
Debt securities, other than asset and mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,841,714.5 |  | 1,463,503.0
Fair Value | 1,857,625.1 | 28,039.7 | 1,478,411.7
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 297,154.7 | 4,485.4 | 194,992.4
Fair Value | 297,241.0 | $ 4,486.7 | 195,058.9
Debt securities, other than asset and mortgage-backed securities | Debentures | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 39,028.0 |  | 14,631.2
Fair Value | 39,234.6 |  | 14,860.3
Debt securities, other than asset and mortgage-backed securities | Commercial paper | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 258,126.7 |  | 180,361.2
Fair Value | ₨ 258,006.4 |  | ₨ 180,198.6

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