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Income Taxes - Summary of Components 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 (₨)
Current taxes        
Domestic ₨ 17,987   ₨ 18,500 ₨ 21,089
Foreign 5,663   7,834 5,412
Current taxes 23,650   26,334 26,501
Deferred taxes        
Domestic (180)   3 (63)
Foreign 1,772   (3,947) (1,225)
Deferred taxes 1,592   (3,944) (1,288)
Income tax expense ₨ 25,242 $ 365 ₨ 22,390 ₨ 25,213