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Summarized Segment Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2023
INR (₨)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
INR (₨)
Mar. 31, 2021
INR (₨)
Mar. 31, 2023
USD ($)
Segment Reporting Information [Line Items]          
Net interest income/(expense) ₨ 913,988.5 $ 11,120.5 ₨ 748,839.5 ₨ 683,686.5  
Less: Provision for credit losses 74,213.8 903.0 126,979.5 154,233.4  
Net interest revenue, after provision for credit losses 839,774.7 10,217.5 621,860.0 529,453.1  
Non-interest revenue 291,386.5 3,545.1 270,574.2 252,975.7  
Non-interest expense (468,779.4) (5,703.7) (373,272.0) (342,602.3)  
Income before income tax expense 662,381.8 8,058.9 519,162.2 439,826.5  
Income tax expense 166,117.4 2,021.1 132,559.2 113,820.1  
Segment assets:          
Segment total assets 25,755,624.0   21,113,705.5 17,979,782.0 $ 313,366.9
Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 913,988.5 11,120.5 748,839.5 683,686.5  
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) 643,295.7   559,824.2 537,763.5  
Less: Provision for credit losses 86,920.2   122,622.6 145,822.0  
Net interest revenue, after provision for credit losses 556,375.5   437,201.6 391,941.5  
Non-interest revenue 252,576.6   203,468.5 175,447.7  
Non-interest expense (432,689.9)   (345,321.5) (306,461.1)  
Income before income tax expense 376,262.2   295,348.6 260,928.1  
Segment assets:          
Segment total assets 13,599,750.2   11,384,802.9 9,356,987.2  
Retail Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 474,489.5   418,823.0 361,343.5  
Retail Banking | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 168,806.2   141,001.2 176,420.0  
Wholesale Banking          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 250,954.1   184,355.0 134,567.3  
Less: Provision for credit losses (12,706.4)   4,356.9 8,411.4  
Net interest revenue, after provision for credit losses 263,660.5   179,998.1 126,155.9  
Non-interest revenue 42,286.9   55,813.2 72,420.1  
Non-interest expense (34,261.7)   (25,544.1) (34,238.4)  
Income before income tax expense 271,685.7   210,267.2 164,337.6  
Segment assets:          
Segment total assets 9,274,409.1   8,106,671.0 7,011,959.9  
Wholesale Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 367,857.6   297,694.0 278,431.0  
Wholesale Banking | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) (116,903.5)   (113,339.0) (143,863.7)  
Treasury Services          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 19,738.7   4,660.3 11,355.7  
Less: Provision for credit losses 0.0   0.0 0.0  
Net interest revenue, after provision for credit losses 19,738.7   4,660.3 11,355.7  
Non-interest revenue (3,477.0)   11,292.5 5,107.9  
Non-interest expense (1,827.8)   (2,406.4) (1,902.8)  
Income before income tax expense 14,433.9   13,546.4 14,560.8  
Segment assets:          
Segment total assets 2,881,464.7   1,622,231.6 1,610,834.9  
Treasury Services | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income/(expense) 71,641.4   32,322.5 43,912.0  
Treasury Services | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net interest income/(expense) ₨ (51,902.7)   ₨ (27,662.2) ₨ (32,556.3)