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Employee Benefits - Summary of Defined Benefit Plan Actuarial (Gains)/ Losses Recognized in Other Comprehensive Income (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disclosure of defined benefit plans [abstract]      
Return on plan assets excluding interest income-loss/(Gain) ₨ (675) ₨ 626 ₨ (30)
Actuarial loss/(gain) arising from financial assumptions 373 (2,106) (625)
Actuarial loss/(gain) arising from demographic assumptions 98 342 (667)
Actuarial loss/ (gain) arising from experience adjustments 82 741 920
Changes in Asset Ceiling (71) 463 0
(Gain)/loss on re-measurement of defined benefit plans, net (193) 66 (402)
Deferred tax (asset)/liability thereon 111 (16) 3
(Gain)/loss on re-measurement of defined benefit plans, net of deferred taxes ₨ (82) ₨ 50 ₨ (399)