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Bank balance - Details of Balance With Banks (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Disclosure of Bank Deposits [line items]        
Current Account ₨ 41,966      
Deposit Account 116,563   ₨ 21,625 ₨ 24,902
Cash and cash equivalents 158,529 $ 2,292 ₨ 44,925 ₨ 52,710
Citibank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 24,507      
Deposit Account 14,737      
Cash and cash equivalents 39,244      
HDFC Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 1,309      
Deposit Account 25,152      
Cash and cash equivalents 26,461      
Axis Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 1      
Deposit Account 21,551      
Cash and cash equivalents 21,552      
Kotak Mahindra Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 28      
Deposit Account 17,221      
Cash and cash equivalents 17,249      
HSBC [member]        
Disclosure of Bank Deposits [line items]        
Current Account 9,776      
Deposit Account 4,112      
Cash and cash equivalents 13,888      
Saudi British Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 845      
Deposit Account 7,006      
Cash and cash equivalents 7,851      
ANZ Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 432      
Deposit Account 6,843      
Cash and cash equivalents 7,275      
ICICI Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 28      
Deposit Account 5,555      
Cash and cash equivalents 5,583      
State Bank of India [member]        
Disclosure of Bank Deposits [line items]        
Current Account 156      
Deposit Account 5,110      
Cash and cash equivalents 5,266      
BNP Paribas [member]        
Disclosure of Bank Deposits [line items]        
Current Account 147      
Deposit Account 3,630      
Cash and cash equivalents 3,777      
IndusInd Bank [member]        
Disclosure of Bank Deposits [line items]        
Deposit Account 2,800      
Cash and cash equivalents 2,800      
Canara Bank [member]        
Disclosure of Bank Deposits [line items]        
Deposit Account 2,500      
Cash and cash equivalents 2,500      
Wells Fargo Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 2,472      
Cash and cash equivalents 2,472      
Standard Chartered Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 374      
Cash and cash equivalents 374      
Indian Overseas Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 1      
Deposit Account 342      
Cash and cash equivalents 343      
Bank of Montreal [member]        
Disclosure of Bank Deposits [line items]        
Current Account 270      
Cash and cash equivalents 270      
MUFG Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 180      
Cash and cash equivalents 180      
UniCredit Bank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 169      
Cash and cash equivalents 169      
Rabobank [member]        
Disclosure of Bank Deposits [line items]        
Current Account 102      
Cash and cash equivalents 102      
Other [member]        
Disclosure of Bank Deposits [line items]        
Current Account 1,169      
Deposit Account 4      
Cash and cash equivalents ₨ 1,173