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Loans, Borrowings and Bank Overdrafts - Summary of Long - Term Loans and Borrowings (Detail)
₨ in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
AUD ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
BRL (R$)
Mar. 31, 2018
AUD ($)
Mar. 31, 2018
CAD ($)
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 29,380       ₨ 54,688        
Obligations under finance leases 2,002       5,442        
Liabilities directly associated with assets held sale         (1,469)        
Finance lease liabilities 2,002       3,973        
Total 31,382       58,661        
Non-current portion of long term loans and borrowings 28,368 $ 410     45,268        
Current portion of long term loans and borrowings 3,014       13,393        
Total ₨ 31,382       58,661        
Unsecured external commercial borrowing 1.81% June 2018 [member] | U.S.Dollar [member]                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans         9,777 $ 150      
Final maturity -                
Unsecured term loan [member] | U.S.Dollar [member]                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 26,395 $ 382     40,715 $ 625      
Final maturity July 2021                
Unsecured term loan [member] | U.S.Dollar [member] | Bottom of range [member]                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate 3.01% 3.01% 3.01% 3.01%          
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% 3.81%          
Unsecured term loan [member] | Canadian Dollar [member]                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 2,701     $ 52 3,660       $ 72
Final maturity July 2021                
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% 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% 3.26%          
Unsecured term loan [member] | Indian Rupee [member]                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 162       366        
Final maturity December 2021                
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% 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% 9.35%          
Unsecured term loan [member] | Australian Dollar [member]                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 70   $ 1   92     $ 2  
Interest rate 4.65% 4.65% 4.65% 4.65%          
Final maturity January 2022                
Unsecured term loan [member] | Great British Pound [member]                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 31       42        
Interest rate 2.93% 2.93% 2.93% 2.93%          
Final maturity February 2022                
Unsecured term loan [member] | EURO [member]                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 19       24        
Interest rate 2.98% 2.98% 2.98% 2.98%          
Final maturity December 2020                
Unsecured term loan [member] | Brazil, Brazil Real                  
Disclosure of detailed information about borrowings [line items]                  
Unsecured loans ₨ 2       ₨ 12   R$ 1    
Interest rate 14.04% 14.04% 14.04% 14.04%          
Final maturity May 2019