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Summarized Segment Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Mar. 31, 2020
USD ($)
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) ₨ 593,527.4 $ 7,872.8 ₨ 507,505.6 ₨ 423,150.6  
Less: Provision for credit losses 117,621.9 1,560.2 72,279.3 59,397.8  
Net interest revenue, after provision for credit losses 475,905.5 6,312.6 435,226.3 363,752.8  
Non-interest revenue 198,219.0 2,629.4 160,122.2 144,607.0  
Non-interest expense (308,280.5) (4,089.2) (255,389.5) (231,253.4)  
Income before income tax expense 365,844.0 4,852.8 339,959.0 277,106.4  
Income tax expense 105,480.0 1,399.1 119,393.5 98,272.5  
Segment assets:          
Segment total assets 15,961,889.1   13,280,073.6 11,367,308.8 $ 211,724.1
Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 593,527.4 $ 7,872.8 507,505.6 423,150.6  
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) 483,083.2   399,016.2 344,888.5  
Less: Provision for credit losses 104,516.8   64,051.0 52,577.1  
Net interest revenue, after provision for credit losses 378,566.4   334,965.2 292,311.4  
Non-interest revenue 161,890.1   138,783.0 122,582.6  
Non-interest expense (278,605.8)   (230,726.5) (210,257.2)  
Income before income tax expense 261,850.7   243,021.7 204,636.8  
Segment assets:          
Segment total assets 8,353,762.3   7,432,733.8 6,351,601.7  
Retail Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 356,017.3   336,677.1 279,198.3  
Retail Banking | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 127,065.9   62,339.1 65,690.2  
Wholesale Banking          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 103,723.3   96,242.2 71,770.2  
Less: Provision for credit losses 13,105.1   8,228.3 6,820.7  
Net interest revenue, after provision for credit losses 90,618.2   88,013.9 64,949.5  
Non-interest revenue 36,059.1   23,789.6 12,674.1  
Non-interest expense (27,774.0)   (22,744.8) (19,792.1)  
Income before income tax expense 98,903.3   89,058.7 57,831.5  
Segment assets:          
Segment total assets 5,933,391.4   4,732,290.7 4,140,606.7  
Wholesale Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 204,725.8   140,085.0 120,341.3  
Wholesale Banking | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) (101,002.5)   (43,842.8) (48,571.1)  
Treasury Services          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 6,720.9   12,247.2 6,491.9  
Less: Provision for credit losses 0.0   0.0 0.0  
Net interest revenue, after provision for credit losses 6,720.9   12,247.2 6,491.9  
Non-interest revenue 269.8   (2,450.4) 9,350.3  
Non-interest expense (1,900.7)   (1,918.2) (1,204.1)  
Income before income tax expense 5,090.0   7,878.6 14,638.1  
Segment assets:          
Segment total assets 1,674,735.4   1,115,049.1 875,100.4  
Treasury Services | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 32,784.3   30,743.5 23,611.0  
Treasury Services | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) ₨ (26,063.4)   ₨ (18,496.3) ₨ (17,119.1)