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Loans, Borrowings and Bank Overdrafts - Summary of Long - Term Loans and Borrowings (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Jun. 23, 2021
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]          
Unsecured loans   ₨ 63,954   ₨ 62,300  
Non-current portion of long-term loans and borrowings   63,954 $ 749 62,300  
Current portion of long term loans and borrowings   0   0  
Unsecured Notes 2026 [member]          
Disclosure of detailed information about borrowings [line items]          
Final maturity June 23, 2026        
Unsecured Notes 2026 [member] | U.S.Dollar [member]          
Disclosure of detailed information about borrowings [line items]          
Unsecured loans   ₨ 63,954 $ 748 ₨ 62,300 $ 747
Final maturity   June-26