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Consolidated Statement of Changes in Equity ₨ in Millions, $ in Millions | INR (₨) | USD ($) | Share capital, fully paid-up [member] INR (₨) shares | Share capital, fully paid-up [member] USD ($) shares | Share premium [member] INR (₨) | Share premium [member] USD ($) | Retained earnings [member] INR (₨) | Retained earnings [member] USD ($) | Share based payment reserve [member] INR (₨) | Share based payment reserve [member] USD ($) | Foreign currency translation reserve [member] INR (₨) | Foreign currency translation reserve [member] USD ($) | [1],[2] | 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, 2015 |  | ₨ 408,815 |  | ₨ 4,937 |  | ₨ 14,031 |  | ₨ 371,478 |  | ₨ 1,312 |  | ₨ 11,249 |  |  | ₨ 3,550 |  | ₨ 624 |  | ₨ 407,181 |  | ₨ 1,634 |
Beginning balance, shares at Mar. 31, 2015 | shares | [1] |  |  | 2,469,043,038 | 2,469,043,038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income for the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit for the year |  | 89,567 |  |  |  |  |  | 89,075 |  |  |  |  |  |  |  |  |  |  | 89,075 |  | 492 |
Other comprehensive income |  | 2,905 |  |  |  |  |  |  |  |  |  | 4,867 |  |  | (1,640) |  | (408) |  | 2,819 |  | 86 |
Total comprehensive income for the year |  | 92,472 |  |  |  |  |  | 89,075 |  |  |  | 4,867 |  |  | (1,640) |  | (408) |  | 91,894 |  | 578 |
Contributions by and distributions to owners of the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (including dividend tax thereon) |  | (35,494) |  |  |  |  |  | (35,494) |  |  |  |  |  |  |  |  |  |  | (35,494) |  |  |
Issue of equity shares on exercise of options |  | 4 |  | ₨ 4 |  | 611 |  |  |  | (611) |  |  |  |  |  |  |  |  | 4 |  |  |
Issue of equity shares on exercise of options, shares | shares | [1] |  |  | 1,670,252 | 1,670,252 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost related to employee share based payment |  | 1,587 |  |  |  |  |  | 59 |  | 1,528 |  |  |  |  |  |  |  |  | 1,587 |  |  |
Total transactions with owners of the Company |  | (33,903) |  | ₨ 4 |  | 611 |  | (35,435) |  | 917 |  |  |  |  |  |  |  |  | (33,903) |  |  |
Total transactions with owners of the Company, shares | shares | [1] |  |  | 1,670,252 | 1,670,252 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the end 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 |
Ending 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (including dividend tax thereon) |  | (8,734) |  |  |  |  |  | (8,734) |  |  |  |  |  |  |  |  |  |  | (8,734) |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |
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 | [2] |  | 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 | $ 1,230 |  |  |  |  | 80,081 |  |  |  |  |  |  |  |  |  |  | 80,081 |  | 3 |
Other comprehensive income |  | (3,109) | (48) |  |  |  |  |  |  |  |  | 3,511 | [2] |  | (6,020) |  | (616) |  | (3,125) |  | 16 |
Total comprehensive income for the year |  | 76,975 | 1,182 |  |  |  |  | 80,081 |  |  |  | 3,511 | [2] |  | (6,020) |  | (616) |  | 76,956 |  | 19 |
Contributions by and distributions to owners of the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (including dividend tax thereon) |  | (5,420) |  |  |  |  |  | (5,420) |  |  |  |  |  |  |  |  |  |  | (5,420) |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |
Buyback of equity shares | [3] | (110,000) |  | ₨ (687) |  | (1,656) |  | (108,344) |  |  |  |  |  |  |  |  | 687 |  | (110,000) |  |  |
Buyback of equity shares, shares | shares | [1],[3] |  |  | (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 | $ 7,454 | ₨ 9,048 | $ 139 | ₨ 800 | $ 12 | ₨ 453,265 | $ 6,962 | ₨ 1,772 | $ 27 | ₨ 16,618 | [2] | $ 255 | ₨ (114) | $ (2) | ₨ 1,547 | $ 24 | ₨ 482,936 | $ 7,417 | ₨ 2,410 | $ 37
Ending balance, shares at Mar. 31, 2018 | shares | [1] |  |  | 4,523,784,491 | 4,523,784,491 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes 14,829,824, 13,728,607 and 23,097,216 treasury shares held as of March 31, 2016, 2017 and 2018, respectively, by a controlled trust. 4,351,775 shares have been transferred by the controlled trust to eligible employees on exercise of options during the year ended March 31, 2018.
[2] | Foreign currency translation reserve includes ₹2,907 directly associated with assets held for sale.
[3] | Refer Note 18.

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- Definition The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase in equity resulting from the sale or issue of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Reduction of issued capital number of shares. + References No definition available. + Details
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- Definition Increase (decrease) through bonus issue of equity shares. + References No definition available. + Details
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- Definition Increase (decrease) through bonus of equity number of shares. + References No definition available. + Details
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- Definition Increase decrease through exercise of options on number of shares. + References No definition available. + Details
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- Definition Increase (decrease) through transaction cost related to buy back. + References No definition available. + Details
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