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Summarized Segment Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Mar. 31, 2022
INR (₨)
Mar. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Net interest income/(expense) ₨ 1,248,003.4 $ 14,974.9 ₨ 913,988.5 ₨ 748,839.5  
Less: Provision for credit losses 133,063.1 1,596.6 74,213.8 126,979.5  
Net interest revenue, after provision for credit losses 1,114,940.3 13,378.3 839,774.7 621,860.0  
Non-interest revenue 738,930.9 8,866.5 291,386.5 270,574.2  
Non-interest expense (1,148,412.2) (13,779.8) (468,779.4) (373,272.0)  
Income before income tax expense 705,459.0 8,465.0 662,381.8 519,162.2  
Income tax expense 77,827.1 933.9 166,117.4 132,559.2  
Segment assets:          
Segment total assets 44,118,573.0   25,755,624.0 21,113,705.5 $ 529,380.6
Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 1,248,003.4 14,974.9 913,988.5 748,839.5  
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) 802,998.2   643,295.7 559,824.2  
Less: Provision for credit losses 118,900.0   86,920.2 122,622.6  
Net interest revenue, after provision for credit losses 684,098.2   556,375.5 437,201.6  
Non-interest revenue 276,151.7   252,576.6 203,468.5  
Non-interest expense (548,753.1)   (432,689.9) (345,321.5)  
Income before income tax expense 411,496.8   376,262.2 295,348.6  
Segment assets:          
Segment total assets 23,256,928.8   13,599,750.2 11,384,802.9  
Retail Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 624,203.3   474,489.5 418,823.0  
Retail Banking | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 178,794.9   168,806.2 141,001.2  
Wholesale Banking          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 315,667.6   250,954.1 184,355.0  
Less: Provision for credit losses 14,163.1   (12,706.4) 4,356.9  
Net interest revenue, after provision for credit losses 301,504.5   263,660.5 179,998.1  
Non-interest revenue 24,303.9   42,286.9 55,813.2  
Non-interest expense (84,735.1)   (34,261.7) (25,544.1)  
Income before income tax expense 241,073.3   271,685.7 210,267.2  
Segment assets:          
Segment total assets 13,133,744.0   9,274,409.1 8,106,671.0  
Wholesale Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 249,868.7   367,857.6 297,694.0  
Wholesale Banking | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 65,798.9   (116,903.5) (113,339.0)  
Treasury Services          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 20,712.9   19,738.7 4,660.3  
Less: Provision for credit losses 0.0   0.0 0.0  
Net interest revenue, after provision for credit losses 20,712.9   19,738.7 4,660.3  
Non-interest revenue 11,784.3   (3,477.0) 11,292.5  
Non-interest expense (6,278.2)   (1,827.8) (2,406.4)  
Income before income tax expense 26,219.0   14,433.9 13,546.4  
Segment assets:          
Segment total assets 2,731,823.5   2,881,464.7 1,622,231.6  
Treasury Services | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 265,306.7   71,641.4 32,322.5  
Treasury Services | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) (244,593.8)   ₨ (51,902.7) ₨ (27,662.2)  
Insurance Services          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 86,474.6        
Less: Provision for credit losses 0.0        
Net interest revenue, after provision for credit losses 86,474.6        
Non-interest revenue 418,250.0        
Non-interest expense (493,763.8)        
Income before income tax expense 10,960.8        
Segment assets:          
Segment total assets 4,387,398.1        
Insurance Services | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 86,474.6        
Insurance Services | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 0.0        
Others          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 22,150.1        
Less: Provision for credit losses 0.0        
Net interest revenue, after provision for credit losses 22,150.1        
Non-interest revenue 8,441.0        
Non-interest expense (14,882.0)        
Income before income tax expense 15,709.1        
Segment assets:          
Segment total assets 608,678.6        
Others | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 22,150.1        
Others | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) ₨ 0.0