Financial Instruments - Summary of Significant Unobservable Inputs to Valuation (Detail) - Unquoted equity investments [member] - INR (₨) ₨ in Millions	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Valuation technique		Discounted cash flow model
Discounted cash flow model [member] \| Long term growth rate [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Valuation technique	Discounted cash flow model
Significant unobservable input	Long term growth rate	Long term growth rate
Movement by	0.50%	0.50%
Increase	₨ 298	₨ 201
Decrease	₨ (273)	₨ (187)
Discounted cash flow model [member] \| Discount rate [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Significant unobservable input	Discount rate	Discount rate
Movement by	0.50%	0.50%
Increase	₨ (388)	₨ (243)
Decrease	₨ 404	₨ 256

The amount of decrease in the fair value measurement of assets due to a change in multiple unobservable inputs to reflect reasonably possible alternative assumptions.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2019-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2019-03-27

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- Definition

The description of inputs used in the fair value measurement of assets. Inputs are the assumptions that market participants would use when pricing the asset, including assumptions about risk such as the risk inherent in a particular valuation technique used to measure fair value (such as a pricing model) and the risk inherent in the inputs to the valuation technique.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2019-01-01
-Paragraph 93
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_d&doctype=Standard
-URIDate 2019-03-27

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- Definition

The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques [member]; Cost approach [member]; Income approach [member]; Market approach [member]]

+ References

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- Definition

The amount of increase in the fair value measurement of assets due to a change in multiple unobservable inputs to reflect reasonably possible alternative assumptions.

+ References

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- Definition

Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities.

+ References

No definition available.

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- Definition

Percentage of increase decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets.

+ References

No definition available.

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