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Employee Benefits - Summary of Fund and Plan Assets of Provident Fund (Detail) - Provident fund [member] - INR (₨)
₨ in Millions
Mar. 31, 2020
Mar. 31, 2019
Disclosure of defined benefit plans [line items]    
Fair value of plan assets ₨ 61,397 ₨ 53,015
Present value of defined benefit obligation (61,397) (53,015)
Net (shortfall)/ excess ₨ 0 ₨ 0