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Income Taxes - Summary of Allocation of Income Tax Expense to Comprehensive Income (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2020 INR (₨)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 INR (₨)	Mar. 31, 2018 INR (₨)
Major components of tax expense (income) [abstract]
Income tax expense as per the consolidated statement of income	₨ 24,799	$ 329	₨ 25,242	₨ 22,390
Income tax included in other comprehensive income on:
Unrealized losses on investment securities	(230)		(65)	(644)
Gains/(losses) on cash flow hedging derivatives	(1,165)		633	(1,448)
Defined benefit plan actuarial gains/(losses)	(196)		47	255
Total income taxes	₨ 23,208		₨ 25,857	₨ 20,553

X

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income; Reserve of gains and losses from investments in equity instruments]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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