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Income Taxes - Summary of Reconciliation of Income Tax Expense (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Profit before taxes ₨ 122,512 $ 1,624 ₨ 115,415 ₨ 102,474
Enacted income tax rate in India 34.94% 34.94% 34.94% 34.61%
Computed expected tax expense ₨ 42,806   ₨ 40,326 ₨ 35,466
Income exempt from tax (12,930)   (18,469) (12,878)
Basis differences that will reverse during a tax holiday period 480   (796) 167
Income taxed at higher/ (lower) rates (3,122)   (1,002) (111)
Reversal of deferred tax for past years due to rate reduction *       (1,563)
Taxes related to prior years (116)   (2,267) (380)
Changes in unrecognized deferred tax assets (3,898)   3,972 239
Expenses disallowed for tax purpose 1,785   3,503 1,431
Others, net (206)   (25) 19
Income tax expense ₨ 24,799 $ 329 ₨ 25,242 ₨ 22,390
Effective income tax rate 20.24% 20.24% 21.87% 21.85%