v3.26.1
Property, Plant and Equipment - Disclosure of Summary about Property, Plant and Equipment (Parenthetical) (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2026
Mar. 31, 2025
Net carrying amount of computer equipment and software [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Net carrying value ₨ 16,719 ₨ 16,003