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Financial Instruments - Summary of Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value of Recurring Basis (Detail) - Fair value measurements at reporting date using [member] - INR (₨) ₨ in Millions | Mar. 31, 2019 | Mar. 31, 2018
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Cash flow hedges [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | ₨ 3,149 | ₨ 1,139
Fair value of financial liabilities | (130) | (1,276)
Level 2 [member] | Cash flow hedges [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 3,149 | 1,139
Fair value of financial liabilities | (130) | (1,276)
Derivative Assets - Others [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 1,955 | 134
Fair value of financial liabilities | (1,180) | (941)
Derivative Assets - Others [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 1,955 | 134
Fair value of financial liabilities | (1,180) | (941)
Investment in liquid and short-term mutual funds [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 13,960 | 46,438
Investment in liquid and short-term mutual funds [member] | Level 1 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 13,960 | 46,438
Investments in equity instruments [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 6,916 | 5,685
Investments in equity instruments [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 248 |
Investments in equity instruments [member] | Level 3 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 6,668 | 5,685
Commercial paper, certificate of deposits and bonds [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 185,048 | 176,234
Commercial paper, certificate of deposits and bonds [member] | Level 1 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 6,865 | 1,951
Commercial paper, certificate of deposits and bonds [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | ₨ 178,183 | ₨ 174,283

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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