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Income Taxes - Summary of Components of Income Tax Expense (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Current taxes        
Domestic ₨ 18,500   ₨ 21,089 ₨ 20,221
Foreign 7,834   5,412 5,536
Current taxes 26,334   26,501 25,757
Deferred taxes        
Domestic 3   (63) (506)
Foreign (3,947)   (1,225) 115
Deferred taxes (3,944)   (1,288) (391)
Income tax expense ₨ 22,390 $ 344 ₨ 25,213 ₨ 25,366