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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, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Mar. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]          
Unsecured loans   ₨ 62,300   ₨ 61,329  
Non-current portion of long-term loans and borrowings   62,300 $ 748 61,272  
Current portion of long term loans and borrowings   0   57  
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   ₨ 62,300 $ 747 61,272 $ 746
Final maturity   June-26      
Unsecured Loans [member] | Indian Rupee [member]          
Disclosure of detailed information about borrowings [line items]          
Unsecured loans   ₨ 0   ₨ 57