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Consolidated Statement of Changes in Equity
₨ in Millions, $ in Millions
INR (₨)
shares
USD ($)
shares
Share capital, fully paid-up [member]
INR (₨)
shares
Share capital, fully paid-up [member]
USD ($)
shares
Securities premium reserve [member]
INR (₨)
Securities premium reserve [member]
USD ($)
Retained earnings [member]
INR (₨)
Retained earnings [member]
USD ($)
Share based payment reserve [member]
INR (₨)
Share based payment reserve [member]
USD ($)
Foreign currency translation reserve [member]
INR (₨)
Foreign currency translation reserve [member]
USD ($)
Cash flow hedging reserves [member]
INR (₨)
Cash flow hedging reserves [member]
USD ($)
Other reserves [member]
INR (₨)
Other reserves [member]
USD ($)
Equity attributable to the equity holders of the Company [member]
INR (₨)
Equity attributable to the equity holders of the Company [member]
USD ($)
Non- controlling interest [member]
INR (₨)
Non- controlling interest [member]
USD ($)
Balance at the beginning of the year at Mar. 31, 2016 ₨ 467,384   ₨ 4,941   ₨ 14,642   ₨ 425,118   ₨ 2,229   ₨ 16,116   ₨ 1,910   ₨ 216   ₨ 465,172   ₨ 2,212  
Beginning balance, shares at Mar. 31, 2016 | shares [1]     2,470,713,290 2,470,713,290                                
Total comprehensive income for the year                                        
Profit for the year 85,143           84,895                   84,895   248  
Other comprehensive income 2,098                   (3,009)   3,996   1,180   2,167   (69)  
Total comprehensive income for the year 87,241           84,895       (3,009)   3,996   1,180   87,062   179  
Contributions by and distributions to owners of the Company                                        
Issue of equity shares on exercise of options         81       (81)                      
Issue of equity shares on exercise of options, shares | shares [1]     187,275 187,275                                
Issue of shares by controlled trust on exercise of options             384   (384)                      
Cash dividend paid (including dividend tax thereon) (8,734)           (8,734)                   (8,734)      
Buyback of equity shares (25,000)   ₨ (80)   (14,254)   (10,746)               80   (25,000)      
Buyback of equity shares, shares | shares [1]     (40,000,000) (40,000,000)                                
Compensation cost related to employee share based payment 1,804           13   1,791               1,804      
Total transactions with owners of the Company (31,930)   ₨ (80)   (14,173)   (19,083)   1,326           80   (31,930)      
Total transactions with owners of the Company, shares | shares [1]     (39,812,725) (39,812,725)                                
Balance at the end of the year at Mar. 31, 2017 522,695   ₨ 4,861   469   490,930   3,555   13,107   5,906   1,476   520,304   2,391  
Ending balance, shares at Mar. 31, 2017 | shares [1]     2,430,900,565 2,430,900,565                                
Total comprehensive income for the year                                        
Profit for the year 80,084           80,081                   80,081   3  
Other comprehensive income (3,109)                   3,511   (6,020)   (616)   (3,125)   16  
Total comprehensive income for the year 76,975           80,081       3,511   (6,020)   (616)   76,956   19  
Contributions by and distributions to owners of the Company                                        
Issue of equity shares on exercise of options 24   ₨ 8   1,987       (1,971)               24      
Issue of equity shares on exercise of options, shares | shares [1]     3,559,599 3,559,599                                
Issue of shares by controlled trust on exercise of options             1,182   (1,182)                      
Cash dividend paid (including dividend tax thereon) (5,420)           (5,420)                   (5,420)      
Buyback of equity shares [2] (110,000)   ₨ (687)   (1,656)   (108,344)               687   (110,000)      
Buyback of equity shares, shares | shares [1]     (343,750,000) (343,750,000)                                
Transaction cost related to buyback (312)           (312)                   (312)      
Bonus issue of equity shares ₨ 4,866   ₨ 4,866       (4,866)                          
Bonus issue of equity shares, shares | shares 2,433,074,327 2,433,074,327 2,433,074,327 [1] 2,433,074,327 [1]                                
Compensation cost related to employee share based payment ₨ 1,384           14   1,370               1,384      
Total transactions with owners of the Company (114,324)   ₨ 4,187   331   (117,746)   (1,783)           687   (114,324)      
Total transactions with owners of the Company, shares | shares [1]     2,092,883,926 2,092,883,926                                
Balance at the end of the year at Mar. 31, 2018 485,346   ₨ 9,048   800   453,265   1,772   16,618   (114)   1,547   482,936   2,410  
Ending balance, shares at Mar. 31, 2018 | shares [1]     4,523,784,491 4,523,784,491                                
Statement [LineItems]                                        
Adjustment on adoption of IFRS 15 | Increase (decrease) due to application of IFRS 15 [member] (2,279)           (2,279)                   (2,279)      
Adjusted balance as at April 1, 2018 483,067   ₨ 9,048   800   450,986   1,772   16,618   (114)   1,547   480,657   2,410  
Total comprehensive income for the year                                        
Profit for the year 90,173 $ 1,302         90,031                   90,031   142  
Other comprehensive income 1,023 15                 (1,368)   2,529   (247)   914   109  
Total comprehensive income for the year 91,196 1,317         90,031       (1,368)   2,529   (247)   90,945   251  
Contributions by and distributions to owners of the Company                                        
Issue of equity shares on exercise of options 4   ₨ 4   528       (528)               4      
Issue of equity shares on exercise of options, shares | shares [1]     1,681,717 1,681,717                                
Issue of shares by controlled trust on exercise of options             565   (565)                      
Cash dividend paid (including dividend tax thereon) [2] (5,434)           (5,434)                   (5,434)      
Bonus issue of equity shares [2]     ₨ 3,016   (795)   (1,454)               (767)          
Bonus issue of equity shares, shares | shares [1]     1,508,469,180 1,508,469,180                                
Loss of control in subsidiary (52)                                   (52)  
Infusion of capital 28                                   28  
Compensation cost related to employee share based payment 1,944           6   1,938               1,944      
Total transactions with owners of the Company (3,510)   ₨ 3,020   (267)   (6,317)   845           (767)   (3,486)   (24)  
Total transactions with owners of the Company, shares | shares [1]     1,510,150,897 1,510,150,897                                
Balance at the end of the year at Mar. 31, 2019 ₨ 570,753 $ 8,252 ₨ 12,068 $ 174 ₨ 533 $ 8 ₨ 534,700 $ 7,731 ₨ 2,617 $ 38 ₨ 15,250 $ 221 ₨ 2,415 $ 35 ₨ 533 $ 7 ₨ 568,116 $ 8,214 ₨ 2,637 $ 38
Ending balance, shares at Mar. 31, 2019 | shares [1]     6,033,935,388 6,033,935,388                                
Statement [LineItems]                                        
Adjusted balance as at April 1, 2018, shares | shares [1]     4,523,784,491 4,523,784,491                                
[1] Includes 23,097,216 and 27,353,853 treasury shares held as at March 31, 2018 and 2019, respectively by a controlled trust. 2,599,183 shares have been transferred by the controlled trust to eligible employees on exercise of options during the year ended March 31, 2019.
[2] Refer Note 18