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Summarized Segment Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2021
INR (₨)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
INR (₨)
Mar. 31, 2019
INR (₨)
Mar. 31, 2021
USD ($)
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) ₨ 683,686.5 $ 9,347.8 ₨ 593,527.4 ₨ 507,505.6  
Less: Provision for credit losses 154,233.4 2,108.7 117,621.9 72,279.3  
Net interest revenue, after provision for credit losses 529,453.1 7,239.1 475,905.5 435,226.3  
Non-interest revenue 252,975.7 3,458.7 198,219.0 160,122.2  
Non-interest expense (342,602.3) (4,684.2) (308,280.5) (255,389.5)  
Income before income tax expense 439,826.5 6,013.6 365,844.0 339,959.0  
Income tax expense 113,820.1 1,556.2 105,480.0 119,393.5  
Segment assets:          
Segment total assets 17,979,782.0   15,961,889.1 13,280,073.6 $ 245,826.9
Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 683,686.5 $ 9,347.8 593,527.4 507,505.6  
Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 0.0   0.0 0.0  
Retail Banking          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 537,763.5   483,083.2 399,016.2  
Less: Provision for credit losses 145,822.0   104,516.8 64,051.0  
Net interest revenue, after provision for credit losses 391,941.5   378,566.4 334,965.2  
Non-interest revenue 175,447.7   161,890.1 138,783.0  
Non-interest expense (306,461.1)   (278,605.8) (230,726.5)  
Income before income tax expense 260,928.1   261,850.7 243,021.7  
Segment assets:          
Segment total assets 9,356,987.2   8,353,762.3 7,432,733.8  
Retail Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 361,343.5   356,017.3 336,677.1  
Retail Banking | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 176,420.0   127,065.9 62,339.1  
Wholesale Banking          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 134,567.3   103,723.3 96,242.2  
Less: Provision for credit losses 8,411.4   13,105.1 8,228.3  
Net interest revenue, after provision for credit losses 126,155.9   90,618.2 88,013.9  
Non-interest revenue 72,420.1   36,059.1 23,789.6  
Non-interest expense (34,238.4)   (27,774.0) (22,744.8)  
Income before income tax expense 164,337.6   98,903.3 89,058.7  
Segment assets:          
Segment total assets 7,011,959.9   5,933,391.4 4,732,290.7  
Wholesale Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 278,431.0   204,725.8 140,085.0  
Wholesale Banking | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) (143,863.7)   (101,002.5) (43,842.8)  
Treasury Services          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 11,355.7   6,720.9 12,247.2  
Less: Provision for credit losses 0.0   0.0 0.0  
Net interest revenue, after provision for credit losses 11,355.7   6,720.9 12,247.2  
Non-interest revenue 5,107.9   269.8 (2,450.4)  
Non-interest expense (1,902.8)   (1,900.7) (1,918.2)  
Income before income tax expense 14,560.8   5,090.0 7,878.6  
Segment assets:          
Segment total assets 1,610,834.9   1,674,735.4 1,115,049.1  
Treasury Services | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 43,912.0   32,784.3 30,743.5  
Treasury Services | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) ₨ (32,556.3)   ₨ (26,063.4) ₨ (18,496.3)