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Details of Guarantees and Documentary Credits Outstanding (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2015
INR (₨)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
INR (₨)
Derivatives, Fair Value [Line Items]      
Bank guarantees ₨ 555,586.6 $ 8,916.5 ₨ 441,559.3
Estimated fair values of bank guarantees (1,758.7) (28.2) (1,480.7)
Financial guarantees      
Derivatives, Fair Value [Line Items]      
Bank guarantees 160,779.8 2,580.3 161,259.8
Performance guarantees      
Derivatives, Fair Value [Line Items]      
Bank guarantees 114,906.3 1,844.1 88,204.3
Documentary credits      
Derivatives, Fair Value [Line Items]      
Bank guarantees 279,900.5 4,492.1 192,095.2
Estimated fair values of bank guarantees (249.0) (4.0) (179.0)
Guarantees      
Derivatives, Fair Value [Line Items]      
Estimated fair values of bank guarantees ₨ (1,509.7) $ (24.2) ₨ (1,301.7)