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Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2015
INR (₨)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
INR (₨)
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value ₨ 191,531.4 $ 3,073.8 ₨ 395,004.3
Less Than 12 Months Unrealized Losses 669.3 10.8 11,788.3
12 Months or Greater Fair Value 277,472.6 4,453.1 304,164.8
12 Months or Greater Unrealized Losses 1,204.8 19.3 8,422.1
Fair Value 469,004.0 7,526.9 699,169.1
Unrealized Losses 1,874.1 $ 30.1 20,210.4
Debt securities, other than asset and mortgage-backed securities      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 170,801.4   382,402.0
Less Than 12 Months Unrealized Losses 216.8   11,374.1
12 Months or Greater Fair Value 277,472.6   304,164.8
12 Months or Greater Unrealized Losses 1,204.8   8,422.1
Fair Value 448,274.0   686,566.8
Unrealized Losses 1,421.6   19,796.2
Debt securities, other than asset and mortgage-backed securities | Government of India securities      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 10,602.4   363,301.9
Less Than 12 Months Unrealized Losses 37.9   11,340.9
12 Months or Greater Fair Value 277,465.1   303,851.6
12 Months or Greater Unrealized Losses 1,204.8   8,421.6
Fair Value 288,067.5   667,153.5
Unrealized Losses 1,242.7   19,762.5
Debt securities, other than asset and mortgage-backed securities | State government securities      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 0.0   123.8
Less Than 12 Months Unrealized Losses 0.0   0.7
12 Months or Greater Fair Value 7.5   37.1
12 Months or Greater Unrealized Losses 0.0   0.2
Fair Value 7.5   160.9
Unrealized Losses 0.0   0.9
Debt securities, other than asset and mortgage-backed securities | Fair Values Of Credit Substitutes      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 158,859.4   18,666.2
Less Than 12 Months Unrealized Losses 177.4   31.3
12 Months or Greater Fair Value 0.0   266.4
12 Months or Greater Unrealized Losses 0.0   0.2
Fair Value 158,859.4   18,932.6
Unrealized Losses 177.4   31.5
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 1,339.6   310.1
Less Than 12 Months Unrealized Losses 1.5   1.2
12 Months or Greater Fair Value 0.0   9.7
12 Months or Greater Unrealized Losses 0.0   0.1
Fair Value 1,339.6   319.8
Unrealized Losses 1.5   1.3
Mortgage-backed securities      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 0.0   133.0
Less Than 12 Months Unrealized Losses 0.0   0.3
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 0.0   133.0
Unrealized Losses 0.0   0.3
Asset-backed securities      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 20,727.1   12,468.3
Less Than 12 Months Unrealized Losses 452.2   409.9
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 20,727.1   12,468.3
Unrealized Losses 452.2   409.9
Equity securities      
Gain (Loss) on Investments [Line Items]      
Less Than 12 Months Fair Value 2.9   1.0
Less Than 12 Months Unrealized Losses 0.3   4.0
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 2.9   1.0
Unrealized Losses ₨ 0.3   ₨ 4.0