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Loans, Borrowings and Bank Overdrafts - Schedule of Future Minimum Lease Payments Under Finance Leases and Present Value of Minimum Lease Payment (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2019
Mar. 31, 2018
Disclosure of finance lease by lessee [line items]    
Minimum lease payments ₨ 2,061 ₨ 5,622
Less: Amounts representing interest (59) (180)
Present value of minimum lease payment payables 2,002 5,442
Liabilities directly associated with assets held for sale   (1,469)
Finance lease liabilities 2,002 3,973
Non-current finance lease payables 496 1,722
Current finance lease payables 1,506 2,251
Not later than one year [member]    
Disclosure of finance lease by lessee [line items]    
Minimum lease payments 1,555 3,838
Present value of minimum lease payment payables 1,506 3,720
Later than one year but not later than five years [member]    
Disclosure of finance lease by lessee [line items]    
Minimum lease payments 506 1,784
Present value of minimum lease payment payables ₨ 496 ₨ 1,722