v3.26.1
Long-Term Debt - Scheduled Maturities of Long-Term Debt (Parenthetical) (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Debt Instrument [Line Items]      
Long-term debt ₨ 5,119,434.0 $ 54,560.7 ₨ 5,866,163.2
Perpetual debt      
Debt Instrument [Line Items]      
Long-term debt ₨ 147,072.0