Investments - Schedule of Investment (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Disclosure of detailed information about financial instruments [line items]
Financial instrument at FVTPL	₨ 46,438		₨ 105,244
Financial instruments at FVTOCI	181,919		150,917
Financial instruments at amortized cost	28,405		42,972
Investments, Total	256,762		299,133
Non-current	7,668	$ 118	7,103
Current	249,094	$ 3,826	292,030
Investments, Total	256,762		299,133
Investment in liquid and short-term mutual funds [member]
Disclosure of detailed information about financial instruments [line items]
Financial instrument at FVTPL	46,438		104,675
Other Investments [member]
Disclosure of detailed information about financial instruments [line items]
Financial instrument at FVTPL			569
Investments in equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial instruments at FVTOCI	5,685		5,303
Commercial paper, certificate of deposits and bonds [member]
Disclosure of detailed information about financial instruments [line items]
Financial instruments at FVTOCI	₨ 176,234		₨ 145,614

The amount of current investments.

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The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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The amount of non-current investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Non-current assets; Investments other than investments accounted for using equity method]

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