v3.26.1
Employee Benefits - Summary of Fund and Plan Assets of Provident Fund (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of defined benefit plans [line items]      
Fair value of plan assets ₨ 29,837 ₨ 22,231 ₨ 20,022
Provident fund [member]      
Disclosure of defined benefit plans [line items]      
Fair value of plan assets 133,417 121,067  
Present value of defined benefit obligation (133,417) (121,067)  
Net shortfall ₨ 0 ₨ 0