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Employee Benefits - Summary of Fund and Plan Assets of Provident Fund (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure of defined benefit plans [line items]    
Fair value of plan assets ₨ 20,022 ₨ 18,005
Provident fund [member]    
Disclosure of defined benefit plans [line items]    
Fair value of plan assets 106,781 90,938
Present value of defined benefit obligation (106,781) (90,938)
Net shortfall ₨ 0 ₨ 0