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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, 2020
Mar. 31, 2019
Mar. 31, 2018
Re-measurement of net defined benefit liability/(asset)      
Return on plan assets excluding interest income - Loss/(Gain) ₨ 76 ₨ (49) ₨ (18)
Actuarial loss/ (gain) arising from financial assumptions 749 73 (296)
Actuarial loss/ (gain) arising from demographic assumptions 227 (40) (54)
Actuarial loss/ (gain) arising from experience adjustments 194 (266) (454)
Defined benefit plan actuarial (gains)/ losses ₨ 1,246 ₨ (282) ₨ (822)