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Significant accounting policies - Summary of difference between the lease obligation disclosed under IAS 17 To IFRS 16 (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2020
Apr. 01, 2019
Mar. 31, 2019
Disclosure Of Difference Between The Lease Obligation Disclosed Under IAS Seventeen To IFRS Sixteen [Line Items]      
Lease liability recognized as at April 1, 2019 ₨ 19,198 ₨ 15,379  
IFRS 16 [Member]      
Disclosure Of Difference Between The Lease Obligation Disclosed Under IAS Seventeen To IFRS Sixteen [Line Items]      
Operating lease commitments disclosed as at March 31, 2019     ₨ 19,741
(Less): Impact of Discounting on Opening Lease liability     (1,954)
(Less): Short-term leases not recognized as a liability     (1,675)
(Less): Low-value leases not recognized as a liability     (64)
(Less): Leases commencing after 1st April, but entered into on or before 31st March     ₨ (669)
Lease liability recognized as at April 1, 2019   ₨ 15,379