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Financial Instruments - Summary of Financial Assets and Liabilities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Assets:        
Cash and cash equivalents ₨ 158,529 $ 2,292 ₨ 44,925 ₨ 52,710
Investments        
Financial instrument at FVTPL 13,960   46,438  
Financial instrument at FVTOCI 191,964   181,919  
Financial instrument at Amortized cost 21,708   28,405  
Other financial assets        
Trade receivables 104,862   105,436  
Unbilled receivables 22,880   42,486  
Other assets 19,757   11,615  
Derivative assets 5,104   1,273  
Total 538,764   462,497  
Trade payables and other payables        
Trade payables and accrued expenses 88,304   68,129  
Other liabilities 644   1,057  
Loans, borrowings and bank overdrafts 99,467   138,259  
Derivative liabilities 1,310   2,217  
Total ₨ 189,725   ₨ 209,662