Employee Benefits - Summary of Change in Present Value of Defined Obligation (Detail) - INR (₨) ₨ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]
Value at the beginning of the year	₨ 20,022	₨ 18,005
Remeasurement loss/(gains)
Actuarial loss/(gain) arising from financial assumptions	146	373	₨ (2,106)
Value at the end of the year	22,231	20,022	18,005
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [line items]
Value at the beginning of the year	21,516	18,613
Addition through Business combination	0	13
Current service cost	3,205	2,993
Interest expense on obligation	1,308	1,178
Benefits paid	(2,627)	(1,927)
Contributions from plan participants due to transfer	558	0
Remeasurement loss/(gains)
Actuarial loss arising from financial assumptions	146	373
Actuarial loss/(gain) arising from demographic assumptions	(115)	98
Actuarial loss/(gain) arising from experience adjustments	(12)	82
Translation adjustment	209	93
Value at the end of the year	₨ 24,188	₨ 21,516	₨ 18,613

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)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Total for all business combinations [member]; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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-Name IAS
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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-Name IAS
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- Definition

Actuarial gains losses arising from change in demographic assumptions net defined benefit liability asset.

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No definition available.

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Actuarial gains losses arising from change in experience adjustments on plan liabilities net defined benefit liability asset.

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No definition available.

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Actuarial gains losses arising from change in financial assumptions net defined benefit liability asset.

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No definition available.

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