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Summarized Segment Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Mar. 31, 2020
INR (₨)
Mar. 31, 2022
USD ($)
Segment Reporting Information [Line Items]          
Net interest income/(expense) ₨ 748,839.5 $ 9,869.9 ₨ 683,686.5 ₨ 593,527.4  
Less: Provision for credit losses 126,979.5 1,673.6 154,233.4 117,621.9  
Net interest revenue, after provision for credit losses 621,860.0 8,196.3 529,453.1 475,905.5  
Non-interest revenue 270,574.2 3,566.3 252,975.7 198,219.0  
Non-interest expense (373,272.0) (4,920.0) (342,602.3) (308,280.5)  
Income before income tax expense 519,162.2 6,842.6 439,826.5 365,844.0  
Income tax expense 132,559.2 1,747.2 113,820.1 105,480.0  
Segment assets:          
Segment total assets 21,113,705.5   17,979,782.0 15,961,889.1 $ 278,287.9
Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 748,839.5 9,869.9 683,686.5 593,527.4  
Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 0.0 $ 0.0 0.0 0.0  
Retail Banking          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 559,824.2   537,763.5 483,083.2  
Less: Provision for credit losses 122,622.6   145,822.0 104,516.8  
Net interest revenue, after provision for credit losses 437,201.6   391,941.5 378,566.4  
Non-interest revenue 203,468.5   175,447.7 161,890.1  
Non-interest expense (345,321.5)   (306,461.1) (278,605.8)  
Income before income tax expense 295,348.6   260,928.1 261,850.7  
Segment assets:          
Segment total assets 11,384,802.9   9,356,987.2 8,353,762.3  
Retail Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 418,823.0   361,343.5 356,017.3  
Retail Banking | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 141,001.2   176,420.0 127,065.9  
Wholesale Banking          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 184,355.0   134,567.3 103,723.3  
Less: Provision for credit losses 4,356.9   8,411.4 13,105.1  
Net interest revenue, after provision for credit losses 179,998.1   126,155.9 90,618.2  
Non-interest revenue 55,813.2   72,420.1 36,059.1  
Non-interest expense (25,544.1)   (34,238.4) (27,774.0)  
Income before income tax expense 210,267.2   164,337.6 98,903.3  
Segment assets:          
Segment total assets 8,106,671.0   7,011,959.9 5,933,391.4  
Wholesale Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 297,694.0   278,431.0 204,725.8  
Wholesale Banking | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) (113,339.0)   (143,863.7) (101,002.5)  
Treasury Services          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 4,660.3   11,355.7 6,720.9  
Less: Provision for credit losses 0.0   0.0 0.0  
Net interest revenue, after provision for credit losses 4,660.3   11,355.7 6,720.9  
Non-interest revenue 11,292.5   5,107.9 269.8  
Non-interest expense (2,406.4)   (1,902.8) (1,900.7)  
Income before income tax expense 13,546.4   14,560.8 5,090.0  
Segment assets:          
Segment total assets 1,622,231.6   1,610,834.9 1,674,735.4  
Treasury Services | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 32,322.5   43,912.0 32,784.3  
Treasury Services | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) ₨ (27,662.2)   ₨ (32,556.3) ₨ (26,063.4)