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Summarized Segment Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | Mar. 31, 2015 INR (₨) | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | ₨ 351,795.6 | $ 5,424.7 | ₨ 292,361.5 | ₨ 236,176.3 |
Less: Provision for credit losses | 37,951.4 | 585.2 | 21,531.3 | 17,000.2 |
Net interest revenue, after allowance for credit losses | 313,844.2 | 4,839.5 | 270,830.2 | 219,176.1 |
Non-interest revenue | 110,326.1 | 1,701.3 | 96,833.9 | 79,821.5 |
Non-interest expense | (204,204.8) | (3,148.8) | (182,077.3) | (144,973.0) |
Income before income tax | 219,965.5 | 3,392.0 | 185,586.8 | 154,024.6 |
Income tax expense | 79,224.9 | 1,221.7 | 67,536.9 | 54,519.9 |
Segment assets: |  |  |  |  |
Segment total assets | 9,066,980.5 |  | 7,736,723.3 | 6,259,015.8 | $ 139,814.7
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | 351,795.6 | 5,424.7 | 292,361.5 | 236,176.3 |
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) | 286,772.9 |  | 237,326.8 | 184,836.2 |
Less: Provision for credit losses | 31,341.7 |  | 19,103.0 | 12,355.4 |
Net interest revenue, after allowance for credit losses | 255,431.2 |  | 218,223.8 | 172,480.8 |
Non-interest revenue | 95,914.4 |  | 85,999.6 | 73,189.9 |
Non-interest expense | (187,591.4) |  | (167,739.7) | (132,305.4) |
Income before income tax | 163,754.2 |  | 136,483.7 | 113,365.3 |
Segment assets: |  |  |  |  |
Segment total assets | 4,987,187.1 |  | 4,534,800.3 | 3,528,407.2 |
Retail Banking | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | 188,803.6 |  | 143,024.7 | 110,165.3 |
Retail Banking | Net interest income (Internal) |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | 97,969.3 |  | 94,302.1 | 74,670.9 |
Wholesale Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | 58,886.8 |  | 39,138.4 | 40,504.0 |
Less: Provision for credit losses | 6,609.7 |  | 2,428.3 | 4,644.8 |
Net interest revenue, after allowance for credit losses | 52,277.1 |  | 36,710.1 | 35,859.2 |
Non-interest revenue | 11,090.1 |  | 11,630.8 | 9,557.4 |
Non-interest expense | (15,352.0) |  | (13,149.2) | (11,547.9) |
Income before income tax | 48,015.2 |  | 35,191.7 | 33,868.7 |
Segment assets: |  |  |  |  |
Segment total assets | 3,346,273.0 |  | 2,741,500.9 | 2,248,913.1 |
Wholesale Banking | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | 159,644.3 |  | 127,326.0 | 108,033.7 |
Wholesale Banking | Net interest income (Internal) |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | (100,757.5) |  | (88,187.6) | (67,529.7) |
Treasury Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | 6,135.9 |  | 15,896.3 | 10,836.1 |
Less: Provision for credit losses | 0.0 |  | 0.0 | 0.0 |
Net interest revenue, after allowance for credit losses | 6,135.9 |  | 15,896.3 | 10,836.1 |
Non-interest revenue | 3,321.6 |  | (796.5) | (2,925.8) |
Non-interest expense | (1,261.4) |  | (1,188.4) | (1,119.7) |
Income before income tax | 8,196.1 |  | 13,911.4 | 6,790.6 |
Segment assets: |  |  |  |  |
Segment total assets | 733,520.4 |  | 460,422.1 | 481,695.5 |
Treasury Services | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | 3,347.7 |  | 22,010.8 | 17,977.3 |
Treasury Services | Net interest income (Internal) |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (External)/ (Internal) | ₨ 2,788.2 |  | ₨ (6,114.5) | ₨ (7,141.2) |

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