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Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value ₨ 756,202.7 $ 9,967.1 ₨ 1,162,001.7
Less Than 12 Months Unrealized Losses 10,558.3 139.1 23,591.6
12 Months or Greater Fair Value 1,035,186.3 13,644.2 98.2
12 Months or Greater Unrealized Losses 40,285.1 531.0 1.1
Fair Value 1,791,389.0 23,611.3 1,162,099.9
Unrealized Losses 50,843.4 $ 670.1 23,592.7
Debt securities, other than asset and mortgage-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 730,622.5   1,112,762.7
Less Than 12 Months Unrealized Losses 10,246.4   23,279.9
12 Months or Greater Fair Value 1,007,543.6   98.2
12 Months or Greater Unrealized Losses 40,016.2   1.1
Fair Value 1,738,166.1   1,112,860.9
Unrealized Losses 50,262.6   23,281.0
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 447,360.3   930,710.0
Less Than 12 Months Unrealized Losses 7,893.5   20,224.7
12 Months or Greater Fair Value 838,788.4   98.2
12 Months or Greater Unrealized Losses 35,052.8   1.1
Fair Value 1,286,148.7   930,808.2
Unrealized Losses 42,946.3   20,225.8
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 118,798.2   43,455.7
Less Than 12 Months Unrealized Losses 972.4   373.3
12 Months or Greater Fair Value 37,138.9   0.0
12 Months or Greater Unrealized Losses 311.1   0.0
Fair Value 155,937.1   43,455.7
Unrealized Losses 1,283.5   373.3
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 15,823.3   4,957.2
Less Than 12 Months Unrealized Losses 163.5   12.3
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 15,823.3   4,957.2
Unrealized Losses 163.5   12.3
Debt securities, other than asset and mortgage-backed securities | State government securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 146,365.0   133,639.8
Less Than 12 Months Unrealized Losses 1,213.6   2,669.6
12 Months or Greater Fair Value 131,616.3   0.0
12 Months or Greater Unrealized Losses 4,652.3   0.0
Fair Value 277,981.3   133,639.8
Unrealized Losses 5,865.9   2,669.6
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 2,275.7   0.0
Less Than 12 Months Unrealized Losses 3.4   0.0
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 2,275.7   0.0
Unrealized Losses 3.4   0.0
Mortgage-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 23.0   0.0
Less Than 12 Months Unrealized Losses 1.3   0.0
12 Months or Greater Fair Value 0.0   0.0
12 Months or Greater Unrealized Losses 0.0   0.0
Fair Value 23.0   0.0
Unrealized Losses 1.3   0.0
Asset-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 25,557.2   49,239.0
Less Than 12 Months Unrealized Losses 310.6   311.7
12 Months or Greater Fair Value 27,642.7   0.0
12 Months or Greater Unrealized Losses 268.9   0.0
Fair Value 53,199.9   49,239.0
Unrealized Losses 579.5   311.7
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