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Summarized Segment Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2015
INR (₨)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
INR (₨)
Mar. 31, 2013
INR (₨)
Mar. 31, 2015
USD ($)
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) ₨ 236,176.3 $ 3,790.4 ₨ 192,572.1 ₨ 157,076.5  
Less: Provision for credit losses 17,000.2 272.8 17,428.1 12,688.0  
Net interest revenue, after allowance for credit losses 219,176.1 3,517.6 175,144.0 144,388.5  
Non-interest revenue 79,821.5 1,281.1 70,834.5 65,177.4  
Non-interest expense (144,973.0) (2,326.8) (124,228.1) (117,591.1)  
Income before income tax 154,024.6 2,471.9 121,750.4 91,974.8  
Income tax expense [1] 54,519.9 875.0 42,304.2 29,840.1  
Segment assets:          
Segment total assets 6,259,015.8   5,125,407.3 4,370,906.1 $ 100,449.7
Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 236,176.3 3,790.4 192,572.1 157,076.5  
Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 0.0 $ 0.0 0.0 0.0  
Retail Banking          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 184,836.2   151,578.5 128,292.8  
Less: Provision for credit losses 12,355.4   14,942.4 11,107.1  
Net interest revenue, after allowance for credit losses 172,480.8   136,636.1 117,185.7  
Non-interest revenue 73,189.9   62,670.8 56,181.9  
Non-interest expense (132,305.4)   (116,511.1) (105,510.9)  
Income before income tax 113,365.3   82,795.8 67,856.7  
Segment assets:          
Segment total assets 3,528,407.2   2,838,734.3 2,301,087.4  
Retail Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 110,165.3   105,479.2 88,384.7  
Retail Banking | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 74,670.9   46,099.3 39,908.1  
Wholesale Banking          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 40,504.0   33,237.1 27,062.6  
Less: Provision for credit losses 4,644.8   2,485.7 1,580.9  
Net interest revenue, after allowance for credit losses 35,859.2   30,751.4 25,481.7  
Non-interest revenue 9,557.4   8,551.4 6,619.0  
Non-interest expense (11,547.9)   (6,354.4) (9,803.3)  
Income before income tax 33,868.7   32,948.4 22,297.4  
Segment assets:          
Segment total assets 2,248,913.1   1,776,968.9 1,684,462.0  
Wholesale Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 108,033.7   82,160.1 68,846.3  
Wholesale Banking | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) (67,529.7)   (48,923.0) (41,783.7)  
Treasury Services          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 10,836.1   7,756.5 1,721.1  
Less: Provision for credit losses 0.0   0.0 0.0  
Net interest revenue, after allowance for credit losses 10,836.1   7,756.5 1,721.1  
Non-interest revenue (2,925.8)   (387.7) 2,376.5  
Non-interest expense (1,119.7)   (1,362.6) (2,276.9)  
Income before income tax 6,790.6   6,006.2 1,820.7  
Segment assets:          
Segment total assets 481,695.5   509,704.1 385,356.7  
Treasury Services | Operating Segments          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) 17,977.3   4,932.8 (154.5)  
Treasury Services | Net interest income (Internal)          
Segment Reporting Information [Line Items]          
Net interest income (External)/ (Internal) ₨ (7,141.2)   ₨ 2,823.7 ₨ 1,875.6  
[1] Does not include the deferred tax effects of unrealized gains and losses on available for sale securities that are included in accumulated other comprehensive income of Rs. (3,771.9) million, Rs. 6,310.3 million and Rs. (11,425.5) million for fiscals March 31, 2013, March 31, 2014 and March 31, 2015, respectively. Includes income tax effects on reclassification adjustment on gains and losses on available for sale securities included in net income reclassified from accumulated other comprehensive income of Rs. 103.8 million, Rs. 10.0 million and Rs. (69.5) million for fiscals March 31, 2013, March 31, 2014 and March 31, 2015, respectively. Further, pretax income and income tax expense are substantially from India.