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Loans, Borrowings and Bank Overdrafts - Additional Information (Detail)
€ in Millions, ₨ in Millions, ر.ق in Millions, ر.س in Millions, ¥ in Millions, £ in Millions, Rp in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
CAD ($)
Mar. 31, 2020
SAR (ر.س)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
GBP (£)
Mar. 31, 2020
CNY (¥)
Mar. 31, 2020
QAR (ر.ق)
Mar. 31, 2020
BRL (R$)
Mar. 31, 2020
MXN ($)
Mar. 31, 2020
IDR (Rp)
Disclosure of detailed information about borrowings [line items]                          
Obligations under finance leases   ₨ 2,002                      
Bottom of range [member]                          
Disclosure of detailed information about borrowings [line items]                          
Finance lease contract term   1 year                      
Top of range [member]                          
Disclosure of detailed information about borrowings [line items]                          
Finance lease contract term   5 years                      
Bank overdraft [member]                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings ₨ 54,020 ₨ 68,085                      
Interest expense on loans, borrowings and bank overdrafts 3,166 4,058 ₨ 3,045                    
Line of credit [member]                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings 17,960                        
Line of credit [member] | U.S.Dollar [member]                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | $       $ 955                  
Remaining borrowing capacity | $       $ 471                  
Line of credit [member] | Canadian Dollar [member]                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | $         $ 71                
Remaining borrowing capacity | $         $ 3                
Line of credit [member] | EURO [member]                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | €             € 19            
Remaining borrowing capacity | €             € 19            
Line of credit [member] | Indonesia, Rupiahs                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | Rp                         Rp 13,000
Remaining borrowing capacity | Rp                         Rp 13,000
Line of credit [member] | Indian Rupee [member]                          
Disclosure of detailed information about borrowings [line items]                          
Remaining borrowing capacity 4,260                        
Line of credit [member] | Brazil, Brazil Real                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | R$                     R$ 10    
Remaining borrowing capacity | R$                     R$ 1    
Line of credit [member] | Saudi Arabia, Riyals                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | ر.س           ر.س 128              
Remaining borrowing capacity | ر.س           ر.س 128              
Line of credit [member] | United Kingdom, Pounds                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | £               £ 7          
Remaining borrowing capacity | £               £ 7          
Line of credit [member] | China, Yuan Renminbi                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | ¥                 ¥ 20        
Remaining borrowing capacity | ¥                 ¥ 20        
Line of credit [member] | Qatar, Rials                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | ر.ق                   ر.ق 10      
Remaining borrowing capacity | ر.ق                   ر.ق 10      
Line of credit [member] | Mexico, Pesos                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings | $                       $ 33  
Remaining borrowing capacity | $                       $ 33  
Revolving credit facilities non-fund based [member]                          
Disclosure of detailed information about borrowings [line items]                          
Short-term borrowings 41,597 40,470                      
Remaining borrowing capacity ₨ 22,790 ₨ 22,014