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Consolidated Statement of Comprehensive Income
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Statement of comprehensive income [abstract]        
Profit for the year ₨ 80,084 $ 1,230 ₨ 85,143 ₨ 89,567
Items that will not be reclassified to profit or loss in subsequent periods        
Defined benefit plan actuarial gains/(losses) 567 9 169 (788)
Net change in fair value of financial instruments through OCI (750) (12) (168) 17
Items that will not be reclassified to profit or loss (183) (3) 1 (771)
Items that may be reclassified to profit or loss in subsequent periods        
Translation difference relating to foreign operations 3,576 55 (3,354) 5,766
Net change in fair value of hedges of net investment in foreign operations (49) (1) 276 (813)
Net change in time value of option contracts designated as cash flow hedges 1   9  
Net change in intrinsic value of option contracts designated as cash flow hedges (76) (1) 77  
Net change in fair value of forward contracts designated as cash flow hedges (5,945) (91) 3,910 (1,640)
Net change in fair value of financial instruments through OCI (433) (7) 1,179 363
Items that may be reclassified subsequently to profit or loss (2,926) (45) 2,097 3,676
Total other comprehensive income, net of taxes (3,109) (48) 2,098 2,905
Total comprehensive income for the year 76,975 1,182 87,241 92,472
Profit attributable to:        
Equity holders of the Company 76,956 1,182 87,062 91,894
Non-controlling interest 19   179 578
Total comprehensive income for the year ₨ 76,975 $ 1,182 ₨ 87,241 ₨ 92,472