Employee benefits (Details 3) - Gratuity Benefits Of Parent [Member] - INR (₨) ₨ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disclosure of fair value of plan assets [line items]
Fair value of plan assets at the beginning of the year	₨ 3,339	₨ 3,064
Employer contributions	1,844	362
Interest on plan assets	229	206
Re-measurements due to:
Return on plan assets excluding interest on plan assets	54	37
Benefits paid	(484)	(330)
Assets (transferred)	(1)	0
Plan assets at the end of the year	₨ 4,981	₨ 3,339

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

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The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Total for all business combinations [member]]

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

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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It represents the amount of interest expense income plan assets.

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