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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, 2020 | Mar. 31, 2019
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Cash flow hedges [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | ₨ 1,382 | ₨ 3,149
Fair value of financial liabilities | (4,057) | (130)
Level 2 [member] | Cash flow hedges [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 1,382 | 3,149
Fair value of financial liabilities | (4,057) | (130)
Derivative Assets - Others [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 1,643 | 1,955
Fair value of financial liabilities | (3,312) | (1,180)
Derivative Assets - Others [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 1,643 | 1,955
Fair value of financial liabilities | (3,312) | (1,180)
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 | 14,795 | 13,960
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 | 14,795 | 13,960
Investments in equity instruments [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 9,297 | 6,916
Investments in equity instruments [member] | Level 2 [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 119 | 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 | 9,178 | 6,668
Commercial paper, certificate of deposits and bonds [member] |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |
Fair value of financial assets | 155,587 | 185,048
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 | 12,983 | 6,865
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 | ₨ 142,604 | ₨ 178,183

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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 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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