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Employee Benefits - Summary of Fund and Plan Assets of Provident Fund (Detail) - Provident fund [member] - INR (₨)
₨ in Millions
Mar. 31, 2018
Mar. 31, 2017
Disclosure of defined benefit plans [line items]    
Fair value of plan assets ₨ 46,016 ₨ 40,059
Present value of defined benefit obligation (46,016) (40,059)
Net (shortfall)/ excess ₨ 0 ₨ 0