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Financial Instruments - Summary of Financial Assets and Liabilities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Assets:        
Cash and cash equivalents ₨ 44,925 $ 690 ₨ 52,710 ₨ 99,049
Investments        
Financial instrument at FVTPL 46,438   105,244  
Financial instrument at FVTOCI 181,919   150,917  
Financial instrument at Amortized cost 28,405   42,972  
Other financial assets        
Trade receivables 105,436   98,844  
Unbilled revenues 42,486   45,095  
Other assets 11,615   13,414  
Derivative assets 1,273   9,853  
Total 462,497   519,049  
Trade payables and other payables        
Trade payables and accrued expenses 68,129   65,486  
Other liabilities 1,057   1,195  
Loans, borrowings and bank overdrafts 138,259   142,412  
Derivative liabilities 2,217   2,710  
Total ₨ 209,662   ₨ 211,803