Employee Benefits - Summary of Defined Benefit Plan Actuarial (Gains)/ Losses Recognized in Other Comprehensive Income (Detail) - INR (₨) ₨ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Disclosure of defined benefit plans [abstract]
Return on plan assets excluding interest income-loss/(Gain)	₨ (416)	₨ (675)	₨ 626
Actuarial loss/(gain) arising from financial assumptions	146	373	(2,106)
Actuarial loss/(gain) arising from demographic assumptions	(115)	98	342
Actuarial loss/ (gain) arising from experience adjustments	(12)	82	741
Change in the effect of asset ceiling - loss/(gain)	74	(71)	463
(Gain)/loss on re-measurement of defined benefit plans, net	(323)	(193)	66
Deferred tax (asset)/liability thereon	49	111	(16)
(Gain)/loss on re-measurement of defined benefit plans, net of deferred taxes	₨ (274)	₨ (82)	₨ 50

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph c
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_ii&doctype=Standard
-URIDate 2024-03-27

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph c
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_iii&doctype=Standard
-URIDate 2024-03-27

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- References

No definition available.

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard
-URIDate 2024-03-27

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- Definition

Actuarial gains losses arising from changes in experience assumptions net defined benefit liability asset.

+ References

No definition available.

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- Definition

Deferred tax assets liabilities.

+ References

No definition available.

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- Definition

(Gain) loss on changes in asset ceiling.

+ References

No definition available.

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- Definition

Gain loss on remeasurement of net defined benefit liability asset net of deferred taxes.

+ References

No definition available.

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- Definition

Return On Plan Assets Excluding Interest Income Net Defined Benefit Liability.

+ References

No definition available.

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