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Bank balance - Details of Balance With Banks (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Disclosure of Bank Deposits [line items]        
Current Account ₨ 34,087      
Deposit Account 110,412   ₨ 116,563 ₨ 21,625
Cash and cash equivalents 144,499 $ 1,917 ₨ 158,529 ₨ 44,925
HDFC Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 599      
Deposit Account 35,670      
Cash and cash equivalents 36,269      
ICICI Bank [member]        
Disclosure of Bank Deposits [line items]        
Deposit Account 34,883      
Cash and cash equivalents 34,883      
Citibank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 18,902      
Deposit Account 7,247      
Cash and cash equivalents 26,149      
Axis Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 1      
Deposit Account 22,988      
Cash and cash equivalents 22,989      
HSBC [member]        
Disclosure of Bank Deposits [line items]        
Current Account 6,729      
Deposit Account 4,672      
Cash and cash equivalents 11,401      
Saudi British Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 955      
Deposit Account 3,311      
Cash and cash equivalents 4,266      
Wells Fargo Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 2,627      
Cash and cash equivalents 2,627      
Kotak Mahindra Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 2      
Deposit Account 1,200      
Cash and cash equivalents 1,202      
BNP Paribas [member]        
Disclosure of Bank Deposits [line items]        
Current Account 1,034      
Cash and cash equivalents 1,034      
ANZ Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 426      
Deposit Account 302      
Cash and cash equivalents 728      
Deutsche Bank [Member]        
Disclosure of Bank Deposits [line items]        
Current Account 496      
Cash and cash equivalents 496      
Standard Chartered Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 341      
Cash and cash equivalents 341      
UniCredit Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 334      
Cash and cash equivalents 334      
JP Morgan Chase [Member]        
Disclosure of Bank Deposits [line items]        
Current Account 107      
Deposit Account 139      
Cash and cash equivalents 246      
MUFG Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 132      
Cash and cash equivalents 132      
Rabobank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 129      
Cash and cash equivalents 129      
Silicon Valley Bank [Member]        
Disclosure of Bank Deposits [line items]        
Current Account 109      
Cash and cash equivalents 109      
United Amara Bank [Member]        
Disclosure of Bank Deposits [line items]        
Current Account 259      
Cash and cash equivalents 259      
Intesa San Paolo [Member]        
Disclosure of Bank Deposits [line items]        
Current Account 108      
Cash and cash equivalents 108      
Other [member]        
Disclosure of Bank Deposits [line items]        
Current Account 797      
Cash and cash equivalents ₨ 797