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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, 2019
Mar. 31, 2018
Mar. 31, 2017
Re-measurement of net defined benefit liability/(asset)      
Return on plan assets excluding interest income ₨ (49) ₨ (18) ₨ (189)
Actuarial loss/ (gain) arising from financial assumptions 73 (296) 363
Actuarial loss/ (gain) arising from demographic assumptions (40) (54) (73)
Actuarial loss/ (gain) arising from experience adjustments (266) (454) (313)
Defined benefit plan actuarial (gains)/ losses ₨ (282) ₨ (822) ₨ (212)