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Employee Benefits - Summary of Change in Plan Assets (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of net defined benefit liability (asset) [abstract]      
Current service cost ₨ 2,682 ₨ 2,674 ₨ 2,085
Net interest on net defined benefit liability/(asset) 45 64 131
Net charge to statement of income 2,727 2,738 2,216
Actual return on plan assets ₨ 184 ₨ 715 ₨ 1,127