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Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value ₨ 32,187.5 $ 465.4 ₨ 748,570.8
Less Than 12 Months Unrealized Losses 137.0 2.0 10,856.5
12 Months or Greater Fair Value 767,531.0 11,097.9 426,172.1
12 Months or Greater Unrealized Losses 11,866.3 171.6 8,764.1
Fair Value 799,718.5 11,563.3 1,174,742.9
Unrealized Losses 12,003.3 $ 173.6 19,620.6
Debt securities, other than asset and mortgage-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 17,996.3   740,181.9
Less Than 12 Months Unrealized Losses 88.1   10,643.3
12 Months or Greater Fair Value 763,992.6   420,466.0
12 Months or Greater Unrealized Losses 11,792.6   8,618.5
Fair Value 781,988.9   1,160,647.9
Unrealized Losses 11,880.7   19,261.8
Debt securities, other than asset and mortgage-backed securities | Government of India securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   540,941.5
Less Than 12 Months Unrealized Losses 0.0   8,852.9
12 Months or Greater Fair Value 568,759.0   342,621.5
12 Months or Greater Unrealized Losses 9,834.9   7,991.0
Fair Value 568,759.0   883,563.0
Unrealized Losses 9,834.9   16,843.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 17,996.3   159,026.1
Less Than 12 Months Unrealized Losses 88.1   1,002.8
12 Months or Greater Fair Value 165,700.5   73,734.9
12 Months or Greater Unrealized Losses 1,475.7   620.3
Fair Value 183,696.8   232,761.0
Unrealized Losses 1,563.8   1,623.1
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   4,057.2
Less Than 12 Months Unrealized Losses 0.0   51.8
12 Months or Greater Fair Value 2,117.6   4,109.6
12 Months or Greater Unrealized Losses 6.3   7.2
Fair Value 2,117.6   8,166.8
Unrealized Losses 6.3   59.0
Debt securities, other than asset and mortgage-backed securities | State government securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   31,940.1
Less Than 12 Months Unrealized Losses 0.0   729.0
12 Months or Greater Fair Value 27,415.5   0.0
12 Months or Greater Unrealized Losses 475.7   0.0
Fair Value 27,415.5   31,940.1
Unrealized Losses 475.7   729.0
Debt securities, other than asset and mortgage-backed securities | Government securities outside India      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   4,217.0
Less Than 12 Months Unrealized Losses 0.0   6.8
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 0.0   4,217.0
Unrealized Losses 0.0   6.8
Mortgage-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   57.0
Less Than 12 Months Unrealized Losses 0.0   0.1
12 Months or Greater Fair Value 45.7   0.0
12 Months or Greater Unrealized Losses 0.4   0.0
Fair Value 45.7   57.0
Unrealized Losses 0.4   0.1
Asset-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 14,191.2   8,331.9
Less Than 12 Months Unrealized Losses 48.9   213.1
12 Months or Greater Fair Value 3,492.7   5,706.1
12 Months or Greater Unrealized Losses 73.3   145.6
Fair Value 17,683.9   14,038.0
Unrealized Losses 122.2   358.7
Other securities (including mutual fund units)      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   0.0
Less Than 12 Months Unrealized Losses 0.0   0.0
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 0.0   0.0
Unrealized Losses ₨ 0.0   ₨ 0.0