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Employee Benefits - Summary of Change in Plan Assets (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of net defined benefit liability (asset) [abstract]      
Current service cost ₨ 1,782 ₨ 1,434 ₨ 1,525
Net interest on net defined benefit liability/(asset) 63 25 7
Net gratuity cost/(benefit) 1,845 1,459 1,532
Actual return on plan assets ₨ 513 ₨ 607 ₨ 501