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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Re-measurement of net defined benefit liability/(asset)      
Return on plan assets excluding interest income-loss/(Gain) ₨ 626 ₨ (30) ₨ (578)
Actuarial loss/ (gain) arising from financial assumptions (2,106) (625) 423
Actuarial loss/ (gain) arising from demographic assumptions 342 (667) 155
Actuarial loss/ (gain) arising from experience adjustments 741 920 (334)
Changes in Asset Ceiling 463 0 0
Defined benefit plan actuarial (gains)/ losses ₨ 66 ₨ (402) ₨ (334)