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Income Taxes - Movement in Deferred Tax Assets and Liabilities (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance ₨ 3,849 ₨ (3,516) ₨ (822)
Credit/(charge) in the consolidated statement of income (1,592) 3,944 1,288
Credit/(charge) in the Other comprehensive income (616) 1,573 (1,218)
On account of business combination   (113) (2,764)
Assets held for sale   1,961  
Other (if any) 546    
Ending balance 2,187 3,849 (3,516)
Carry forward losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 5,694 5,513 5,250
Credit/(charge) in the consolidated statement of income (2,879) 133 825
Credit/(charge) in the Other comprehensive income 334 48 (562)
Ending balance 3,149 5,694 5,513
Trade payables, accrued expenses and other liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 3,107 3,151 3,270
Credit/(charge) in the consolidated statement of income 295 243 (44)
Credit/(charge) in the Other comprehensive income (22) (246) (75)
Assets held for sale   (41)  
Other (if any) 333    
Ending balance 3,713 3,107 3,151
Allowances for lifetime expected credit loss [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 4,499 2,955 3,039
Credit/(charge) in the consolidated statement of income 9 1,564 (77)
Credit/(charge) in the Other comprehensive income 2 2 (7)
Assets held for sale   (22)  
Other (if any) 11    
Ending balance 4,521 4,499 2,955
Minimum alternate tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 74 1,520 1,457
Credit/(charge) in the consolidated statement of income (74) (1,446) 63
Ending balance   74 1,520
Property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (2,166) (4,153) (4,262)
Credit/(charge) in the consolidated statement of income 219 912 (249)
Credit/(charge) in the Other comprehensive income (94) (75) 358
Assets held for sale   1,150  
Other (if any) 201    
Ending balance (1,840) (2,166) (4,153)
Amortizable goodwill [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (1,810) (4,057) (3,963)
Credit/(charge) in the consolidated statement of income 16 1,522 (401)
Credit/(charge) in the Other comprehensive income (105) (53) 307
Assets held for sale   778  
Ending balance (1,899) (1,810) (4,057)
Intangible assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (3,190) (4,511) (4,665)
Credit/(charge) in the consolidated statement of income 1,076 1,546 2,639
Credit/(charge) in the Other comprehensive income (181) (112) 279
On account of business combination   (113) (2,764)
Ending balance (2,295) (3,190) (4,511)
Interest on bonds and fair value movement of investments [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (1,712) (2,245) (814)
Credit/(charge) in the consolidated statement of income 186 (112) (837)
Credit/(charge) in the Other comprehensive income 71 645 (594)
Ending balance (1,455) (1,712) (2,245)
Cash flow hedges [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance 29 (1,419) (458)
Credit/(charge) in the Other comprehensive income (633) 1,448 (961)
Ending balance (604) 29 (1,419)
Contract liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (273) (183) (4)
Credit/(charge) in the consolidated statement of income (1) (35) (192)
Credit/(charge) in the Other comprehensive income (15) (9) 13
Assets held for sale   (46)  
Ending balance (289) (273) (183)
Others [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Beginning balance (403) (87) 328
Credit/(charge) in the consolidated statement of income (439) (383) (439)
Credit/(charge) in the Other comprehensive income 27 (75) 24
Assets held for sale   142  
Other (if any) 1    
Ending balance ₨ (814) ₨ (403) ₨ (87)