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Bank balance - Details of Balance With Banks (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Disclosure of Bank Deposits [Line Items]        
Current Account ₨ 23,300      
Deposit Account 21,625   ₨ 24,902 ₨ 35,531
Cash and cash equivalents 44,925 $ 690 ₨ 52,710 ₨ 99,049
Citibank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 12,144      
Deposit Account 1,007      
Cash and cash equivalents 13,151      
HSBC [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 4,907      
Deposit Account 3,323      
Cash and cash equivalents 8,230      
Deutsche Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Deposit Account 4,500      
Cash and cash equivalents 4,500      
Yes Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 53      
Deposit Account 4,216      
Cash and cash equivalents 4,269      
ANZ Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 232      
Deposit Account 3,845      
Cash and cash equivalents 4,077      
HDFC Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 517      
Deposit Account 2,150      
Cash and cash equivalents 2,667      
Saudi British Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 100      
Deposit Account 1,651      
Cash and cash equivalents 1,751      
Wells Fargo Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 1,400      
Cash and cash equivalents 1,400      
Standard Chartered Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 706      
Cash and cash equivalents 706      
ICICI Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 12      
Deposit Account 602      
Cash and cash equivalents 614      
Silicon Valley Bank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 331      
Cash and cash equivalents 331      
IOB [member]        
Disclosure of Bank Deposits [Line Items]        
Deposit Account 292      
Cash and cash equivalents 292      
Unicredit Bank Austria A G [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 192      
Cash and cash equivalents 192      
Bank of Montreal [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 192      
Cash and cash equivalents 192      
BNP Paribas [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 156      
Cash and cash equivalents 156      
Kreissparkasse [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 135      
Cash and cash equivalents 135      
Rabobank [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 66      
Cash and cash equivalents 66      
State Bank of India [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 65      
Cash and cash equivalents 65      
Bradesco SA [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 56      
Deposit Account 3      
Cash and cash equivalents 59      
Funds in Transit [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 1,134      
Cash and cash equivalents 1,134      
Other [member]        
Disclosure of Bank Deposits [Line Items]        
Current Account 902      
Deposit Account 36      
Cash and cash equivalents ₨ 938