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Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]      
Carry-forward losses * ₨ 5,694   ₨ 5,513
Accrued expenses and liabilities 3,107   3,151
Allowances for lifetime expected credit loss 4,499   2,955
Minimum alternate tax 74   1,520
Cash flow hedges 29    
Deferred tax assets, Gross1, Total 13,403   13,139
Property, plant and equipment (2,166)   (4,153)
Amortizable goodwill (1,810)   (4,057)
Intangible assets (3,190)   (4,511)
Interest on bonds and fair value movement of investments (1,712)   (2,245)
Cash flow hedges     (1,419)
Deferred revenue (273)   (183)
Others (403)   (87)
Deferred tax liability, Gross (9,554)   (16,655)
Net deferred tax assets / (liabilities) 3,849   (3,516)
Deferred tax assets 6,908 $ 106 3,098
Deferred tax liabilities ₨ (3,059) $ (47) ₨ (6,614)