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Consolidated Statements of Comprehensive Income (Loss) Statement - CAD | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of comprehensive income [abstract] |  |  |  |  |  |
Net earnings (loss) |  | CAD (118,000,000) | CAD 276,000,000 |  | CAD 116,000,000 |
Other comprehensive income (loss) |  |  |  |  |  |
Net actuarial gains (losses) on defined benefit plans, net of tax |  | (6,000,000) | 8,000,000 | [1] | 4,000,000 | [1]
Gains (losses) on derivatives designated as cash flow hedges, net of tax | [2] | (1,000,000) | (1,000,000) |  | 3,000,000 |
Total items that will not be reclassified subsequently to net earnings |  | (7,000,000) | 7,000,000 |  | 7,000,000 |
Net gains on translating net assets of foreign operations, net of hedges and of tax | [3] | (80,000,000) | (71,000,000) |  | 247,000,000 |
Reclassification of translation gains on net assets of divested foreign operations (Note 4) |  | (9,000,000) | 0 |  | (10,000,000) |
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax | [4] | 50,000,000 | 18,000,000 |  | (172,000,000) |
Reclassification of losses on financial instruments designated as hedges of divested foreign operations, net of tax | [5] | 14,000,000 | 0 |  | 6,000,000 |
Net gains on derivatives designated as cash flow hedges, net of tax | [6] | 214,000,000 | 179,000,000 |  | 375,000,000 |
Reclassification of gains on derivatives designated as cash flow hedges to net earnings, net of tax | [7] | (107,000,000) | (48,000,000) |  | (194,000,000) |
Total items that will be reclassified subsequently to net earnings |  | 82,000,000 | 78,000,000 |  | 252,000,000 |
Other comprehensive income |  | 75,000,000 | 85,000,000 |  | 259,000,000 |
Total comprehensive income (loss) |  | (43,000,000) | 361,000,000 |  | 375,000,000 |
Total comprehensive income (loss) attributable to: |  |  |  |  |  |
TransAlta shareholders |  | (74,000,000) | 215,000,000 |  | 272,000,000 |
Non-controlling interests (Note 11) |  | 31,000,000 | 146,000,000 |  | 103,000,000 |
Net actuarial gains (losses) |  | (4,000,000) | 4,000,000 |  | 0 |
Income tax relating to gains (losses) on derivatives designated as cash flow hedges |  | 0 | 0 |  | 1,000,000 |
Income tax relating to exchange differences on translation of other comprehensive income |  | 0 | 11,000,000 |  | 0 |
Income Tax Relating To Actuarial Gains (Losses) Arising From Changes In Financial Assumptions Of Other Comprehensive Income |  | 11,000,000 | 0 |  | 0 |
Income tax relating to hedges of net investments in foreign operations of other comprehensive income |  | 2,000,000 | 5,000,000 |  | 7,000,000 |
Income tax recovery relating to reclassification Of Losses on financial instruments designed as hedges of divested foreign operations |  | 2,000,000 | 0 |  | 1,000,000 |
Income tax expense (recovery) relating to gains on derivatives designated as cash flow hedges of other comprehensive income |  | (77,000,000) | (92,000,000) |  | (138,000,000) |
Income tax expense relating to reclassification of gains on derivatives designated as cash flow hedges to net earnings |  | CAD 31,000,000 | CAD 41,000,000 |  | CAD 50,000,000 |
[1] | (1) Net of income tax recovery of 4 for the year ended Dec. 31, 2017 (2016 - 4 expense, 2015 - nil ).
[2] | (2) Net of income tax expense of nil for the year ended Dec. 31, 2017 (2016 - nil , 2015 - 1 expense).
[3] | (3) Net of income tax expense of nil for the year ended Dec. 31, 2017 (2016 - 11, 2015 - nil).
[4] | (5) Net of income tax expense of 2 for the year ended Dec. 31, 2017 (2016 - 5 expense, 2015 - 7 expense)
[5] | (6) Net of reclassification of income tax recovery of 2 for the year ended Dec. 31, 2017 (2016 - nil recovery, 2015 - 1 recovery).
[6] | (7) Net of income tax recovery of 77 for the year ended Dec. 31, 2017 (2016 - 92 expense, 2015 - 138 expense).
[7] | (8) Net of reclassification of income tax expense of 31 for the year ended Dec. 31, 2017 (2016 - 41 expense, 2015 - 50 expense).

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- Definition The amount of comprehensive income attributable to non-controlling interests. [Refer: Comprehensive income; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 81B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_81B_b_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_i&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24E_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to hedges of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income; Reserve of gains and losses on hedging instruments that hedge investments in equity instruments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_90&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_90&doctype=Standard -URIDate 2017-03-09 + Details
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