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Income Taxes - Summary of Components of Income Tax Expense (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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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

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