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Capital Stock and Long-term Retention Plan - Reconciliation of shares (Details) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 341,268,300 | 338,468,300
Acquired under share repurchase program (in shares) | (633,600) |
Acquired by trust under LTRP (in shares) | (3,267,300) | (1,525,100)
Released (in shares) | 4,969,700 | 4,325,100
Outstanding at end of period (in shares) | 342,337,100 | 341,268,300
Series "D" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 85,592,100 | 84,859,500
Acquired under share repurchase program (in shares) | (189,600) |
Acquired by trust under LTRP (in shares) | (977,400) | (456,200)
Released (in shares) | 1,381,700 | 1,188,800
Outstanding at end of period (in shares) | 85,806,800 | 85,592,100
Series "L" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 85,592,100 | 84,859,500
Acquired under share repurchase program (in shares) | (189,600) |
Acquired by trust under LTRP (in shares) | (977,400) | (456,200)
Released (in shares) | 1,381,700 | 1,188,800
Outstanding at end of period (in shares) | 85,806,800 | 85,592,100
Series "A" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 116,283,300 | 115,409,000
Acquired under share repurchase program (in shares) | (135,300) |
Acquired by trust under LTRP (in shares) | (698,100) | (325,900)
Released (in shares) | 1,337,800 | 1,200,200
Outstanding at end of period (in shares) | 116,787,700 | 116,283,300
Series "B" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 53,800,800 | 53,340,300
Acquired under share repurchase program (in shares) | (119,100) |
Acquired by trust under LTRP (in shares) | (614,400) | (286,800)
Released (in shares) | 868,500 | 747,300
Outstanding at end of period (in shares) | 53,935,800 | 53,800,800
CPOs |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 2,445,500 | 2,424,600
Acquired under share repurchase program (in shares) | (5,400) |
Acquired by trust under LTRP (in shares) | (27,900) | (13,100)
Released (in shares) | 39,400 | 34,000
Outstanding at end of period (in shares) | 2,451,600 | 2,445,500

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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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