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Income Taxes - Summary of Reconciliation of Income Tax Expense (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Profit before taxes ₨ 115,415 $ 1,667 ₨ 102,474 ₨ 110,356
Enacted income tax rate in India 34.94% 34.94% 34.61% 34.61%
Computed expected tax expense ₨ 40,326   ₨ 35,466 ₨ 38,194
Income exempt from tax (18,469)   (12,878) (12,684)
Basis differences that will reverse during a tax holiday period (796)   167 (274)
Income taxed at higher/ (lower) rates (1,002)   (111) (1,105)
Reversal of deferred tax for past years due to rate reduction *     (1,563)  
Taxes related to prior years (2,267)   (380) (593)
Changes in unrecognized deferred tax assets 3,972   239 40
Expenses disallowed for tax purpose 3,503   1,431 1,787
Others, net (25)   19 (152)
Income tax expense ₨ 25,242 $ 365 ₨ 22,390 ₨ 25,213
Effective income tax rate 21.87% 21.87% 21.85% 22.85%