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Consolidated Statement of Changes in Equity ₨ in Millions, $ in Millions | INR (₨) | USD ($) | Adjustment On Adoption Of IFRS Sixteen [member] INR (₨) | Share capital, fully paid-up [member] INR (₨) shares | Share capital, fully paid-up [member] USD ($) shares | Securities premium reserve [member] INR (₨) | Securities premium reserve [member] USD ($) | Retained earnings [member] INR (₨) | Retained earnings [member] USD ($) | Retained earnings [member] Adjustment On Adoption Of IFRS Sixteen [member] INR (₨) | 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 ($) | Equity attributable to the equity holders of the Company [member] Adjustment On Adoption Of IFRS Sixteen [member] INR (₨) | Non- controlling interest [member] INR (₨) | Non- controlling interest [member] USD ($)
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Balance at the beginning 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 |
Beginning 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],[2] |  |  |  | (343,750,000) | (343,750,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction cost related to buyback |  | (312) |  |  |  |  |  |  | (312) |  |  |  |  |  |  |  |  |  |  | (312) |  |  |  |
Bonus issue of equity shares |  |  |  |  | ₨ 4,866 |  |  |  | (4,866) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonus issue of equity shares, shares | shares | [1] |  |  |  | 2,433,074,327 | 2,433,074,327 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Increase (decrease) due to application of IFRS 15 [member] |  | (2,279) |  |  |  |  |  |  | (2,279) |  |  |  |  |  |  |  |  |  |  | (2,279) |  |  |  |
Adjusted balance |  | 483,067 |  |  | ₨ 9,048 |  | 800 |  | 450,986 |  |  | 1,772 |  | 16,618 |  | (114) |  | 1,547 |  | 480,657 |  |  | 2,410 |
Adjusted balance, shares | shares | [1] |  |  |  | 4,523,784,491 | 4,523,784,491 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income for the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit for the year |  | 90,173 |  |  |  |  |  |  | 90,031 |  |  |  |  |  |  |  |  |  |  | 90,031 |  |  | 142 |
Other comprehensive income |  | 1,023 |  |  |  |  |  |  |  |  |  |  |  | (1,368) |  | 2,529 |  | (247) |  | 914 |  |  | 109 |
Total comprehensive income for the year |  | 91,196 |  |  |  |  |  |  | 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],[2] |  |  |  | 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 |  |  | ₨ 12,068 |  | 533 |  | 534,700 |  |  | 2,617 |  | 15,250 |  | 2,415 |  | 533 |  | 568,116 |  |  | 2,637 |
Ending balance, shares at Mar. 31, 2019 | shares | [1] |  |  |  | 6,033,935,388 | 6,033,935,388 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement [LineItems] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment on adoption of IFRS | [3] |  |  | ₨ (872) |  |  |  |  |  |  | ₨ (872) |  |  |  |  |  |  |  |  |  |  | ₨ (872) |  |
Adjusted balance |  | 569,881 |  |  | ₨ 12,068 |  | 533 |  | 533,828 |  |  | 2,617 |  | 15,250 |  | 2,415 |  | 533 |  | 567,244 |  |  | 2,637 |
Adjusted balance, shares | shares | [1] |  |  |  | 6,033,935,388 | 6,033,935,388 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income for the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit for the year |  | 97,713 | $ 1,295 |  |  |  |  |  | 97,218 |  |  |  |  |  |  |  |  |  |  | 97,218 |  |  | 495 |
Other comprehensive income |  | 4,613 | 61 |  |  |  |  |  |  |  |  |  |  | 8,289 |  | (4,730) |  | 896 |  | 4,455 |  |  | 158 |
Total comprehensive income for the year |  | 102,326 | 1,356 |  |  |  |  |  | 97,218 |  |  |  |  | 8,289 |  | (4,730) |  | 896 |  | 101,673 |  |  | 653 |
Contributions by and distributions to owners of the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity shares on exercise of options |  | 5 |  |  | ₨ 5 |  | 742 |  |  |  |  | (742) |  |  |  |  |  |  |  | 5 |  |  |  |
Issue of equity shares on exercise of options, shares | shares | [1] |  |  |  | 2,498,925 | 2,498,925 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of shares by controlled trust on exercise of options |  |  |  |  |  |  |  |  | 1,026 |  |  | (1,026) |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (including dividend tax thereon) | [2] | (6,863) |  |  |  |  |  |  | (6,863) |  |  |  |  |  |  |  |  |  |  | (6,863) |  |  |  |
Buyback of equity shares | [2] | (105,000) |  |  | ₨ (646) |  |  |  | (105,000) |  |  |  |  |  |  |  |  | 646 |  | (105,000) |  |  |  |
Buyback of equity shares, shares | shares | [1],[2] |  |  |  | (323,076,923) | (323,076,923) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction cost related to buyback |  | (311) |  |  |  |  |  |  | (311) |  |  |  |  |  |  |  |  |  |  | (311) |  |  |  |
Compensation cost related to employee share-based payment |  | 1,271 |  |  |  |  |  |  | 9 |  |  | 1,262 |  |  |  |  |  |  |  | 1,271 |  |  |  |
Effect of modification of ADS RSUs from equity settled to cash settled | [4] | (561) |  |  |  |  |  |  |  |  |  | (561) |  |  |  |  |  |  |  | (561) |  |  |  |
Cash dividend paid to Non-controlling interest |  | (1,415) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,415) |
Total transactions with owners of the Company |  | (112,874) |  |  | ₨ (641) |  | 742 |  | (111,139) |  |  | (1,067) |  |  |  |  |  | 646 |  | (111,459) |  |  | (1,415) |
Total transactions with owners of the Company, shares | shares | [1] |  |  |  | (320,577,998) | (320,577,998) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the end of the year at Mar. 31, 2020 |  | ₨ 559,333 | $ 7,420 |  | ₨ 11,427 | $ 152 | ₨ 1,275 | $ 17 | ₨ 519,907 | $ 6,896 |  | ₨ 1,550 | $ 21 | ₨ 23,539 | $ 312 | ₨ (2,315) | $ (31) | ₨ 2,075 | $ 28 | ₨ 557,458 | $ 7,395 |  | ₨ 1,875 | $ 25
Ending balance, shares at Mar. 31, 2020 | shares | [1] |  |  |  | 5,713,357,390 | 5,713,357,390 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes 23,097,216, 27,353,853 and 22,746,081 treasury shares held as at March 31, 2018, 2019 and 2020, respectively by a controlled trust. 4,351,775, 2,599,183 and 4,607,772 shares have been transferred by the controlled trust to eligible employees on exercise of options during the year ended March 31, 2018, 2019 and 2020, respectively.
[2] | Refer to Note 22
[3] | Refer to Note 3
[4] | Refer to Note 30

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