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Income Taxes - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2020 INR (₨) ₨ / shares | Mar. 31, 2019 INR (₨) ₨ / shares | Mar. 31, 2018 INR (₨) ₨ / shares | Mar. 31, 2020 USD ($)
Disclosure of income tax expense [line items] |  |  |  |
Deferred tax asset of unused tax losses not recognized | ₨ 8,124 | ₨ 6,769 |  |
Tax loss carry-forwards | 29,736 | 24,355 |  |
Tax loss carry-forwards not currently subject to expiration dates | 14,429 | 8,191 |  |
Tax loss carry-forwards expires in various years | ₨ 15,307 | 16,164 |  |
Tax loss carry-forwards expiration period | 2038 |  |  |
Deferred tax asset of unused tax losses recognized | ₨ 6,005 | 5,604 |  | $ 80
Minimum alternate tax | 3,425 | 0 |  |
Decrease of current tax expense due to tax holidays | ₨ 11,963 | ₨ 15,390 | ₨ 11,635 |
Tax incentives per share | ₨ / shares | ₨ 2.05 | ₨ 2.56 | ₨ 1.84 |
Deferred tax liabilities on cumulative earnings of subsidiaries | ₨ 56,391 | ₨ 52,488 |  |
Branch profit tax percentage | 15.00% |  |  |
Unused tax losses [member] |  |  |  |
Disclosure of income tax expense [line items] |  |  |  |
Deferred tax asset of unused tax losses recognized | ₨ 2,044 | ₨ 3,149 |  |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_o&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_56&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Decrease in income tax expense due to tax holidays. + References No definition available. + Details
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- Definition Deferred tax assets minimum alternate tax. + References No definition available. + Details
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- Definition Deferred tax assets relating to tax loss carry-forwards, not recognized. + References No definition available. + Details
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- Definition Deferred tax liabilities on cumulative earnings of subsidiaries. + References No definition available. + Details
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- Definition Unrecognized deferred tax assets tax loss carry forward with expiration. + References No definition available. + Details
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- Details
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