Employee Benefits - Summary of Defined Benefit Plans (Detail) - INR (₨) ₨ in Millions |
12 Months Ended | ||
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Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Disclosure of net defined benefit liability (asset) [abstract] | |||
| Current service cost | ₨ 3,795 | ₨ 3,205 | ₨ 2,993 |
| Past service Cost | 3,566 | 0 | 0 |
| Net interest expense on net defined benefit liability | 268 | 95 | 45 |
| Net charge to consolidated statement of income | 7,629 | 3,300 | 3,038 |
| Actual return on plan assets | ₨ 879 | ₨ 1,646 | ₨ 1,828 |
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [domain]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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