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Loans, Borrowings and Bank Overdrafts - Summary of Long - Term Loans and Borrowings (Detail)
₨ in Millions, $ in Millions, $ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
AUD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
AUD ($)
Disclosure of detailed information about borrowings [line items]              
Unsecured loans ₨ 24,022     ₨ 29,380      
Obligations under finance leases       2,002      
Total       31,382      
Non-current portion of long term loans and borrowings 4,840 $ 64   28,368      
Current portion of long term loans and borrowings 19,182     3,014      
Unsecured term loan [member] | U.S.Dollar [member]              
Disclosure of detailed information about borrowings [line items]              
Unsecured loans ₨ 23,478 $ 311   26,395 $ 382    
Final maturity July-21            
Unsecured term loan [member] | U.S.Dollar [member] | Bottom of range [member]              
Disclosure of detailed information about borrowings [line items]              
Interest rate 2.20% 2.20% 2.20%        
Unsecured term loan [member] | U.S.Dollar [member] | Top of range [member]              
Disclosure of detailed information about borrowings [line items]              
Interest rate 3.81% 3.81% 3.81%        
Unsecured term loan [member] | Canadian Dollar [member]              
Disclosure of detailed information about borrowings [line items]              
Unsecured loans ₨ 25     2,701   $ 52  
Final maturity July-21            
Unsecured term loan [member] | Canadian Dollar [member] | Bottom of range [member]              
Disclosure of detailed information about borrowings [line items]              
Interest rate 1.48% 1.48% 1.48%        
Unsecured term loan [member] | Canadian Dollar [member] | Top of range [member]              
Disclosure of detailed information about borrowings [line items]              
Interest rate 3.26% 3.26% 3.26%        
Unsecured term loan [member] | Indian Rupee [member]              
Disclosure of detailed information about borrowings [line items]              
Unsecured loans ₨ 440     162      
Final maturity March-24            
Unsecured term loan [member] | Indian Rupee [member] | Bottom of range [member]              
Disclosure of detailed information about borrowings [line items]              
Interest rate 8.29% 8.29% 8.29%        
Unsecured term loan [member] | Indian Rupee [member] | Top of range [member]              
Disclosure of detailed information about borrowings [line items]              
Interest rate 9.35% 9.35% 9.35%        
Unsecured term loan [member] | Australian Dollar [member]              
Disclosure of detailed information about borrowings [line items]              
Unsecured loans ₨ 44   $ 1 70     $ 1
Interest rate 4.65% 4.65% 4.65%        
Final maturity January-22            
Unsecured term loan [member] | Great British Pound [member]              
Disclosure of detailed information about borrowings [line items]              
Unsecured loans ₨ 22     31      
Interest rate 2.93% 2.93% 2.93%        
Final maturity February-22            
Unsecured term loan [member] | EURO [member]              
Disclosure of detailed information about borrowings [line items]              
Unsecured loans ₨ 13     19      
Interest rate 2.87% 2.87% 2.87%        
Final maturity March-23            
Unsecured term loan [member] | Brazil, Brazil Real              
Disclosure of detailed information about borrowings [line items]              
Unsecured loans       ₨ 2