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Employee Benefits - Summary of Fund and Plan Assets of Provident Fund (Detail) - Provident fund [member] - INR (₨)
₨ in Millions
Mar. 31, 2023
Mar. 31, 2022
Disclosure of defined benefit plans [line items]    
Fair value of plan assets ₨ 90,938 ₨ 76,573
Present value of defined benefit obligation (90,938) (76,573)
Net shortfall ₨ 0 ₨ 0