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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of analysis of other comprehensive income by item [abstract] |
Disclosure of changes in accumulated other comprehensive income (loss) | The components of, and changes in, accumulated other comprehensive income (loss) are as follows:
| 2017 |  | 2016 |
Currency translation adjustment |  |
Opening balance, Jan. 1 | (1 | ) | 52 |
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax(1) | (89 | ) | (71 | )
Gains on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax(2) | 64 |  | 18 |
Balance, Dec. 31 | (26 | ) | (1 | )
Cash flow hedges |  |  |  |
Opening balance, Jan. 1 | 456 |  | 350 |
Gains on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax(3) | 106 |  | 106 |
Balance, Dec. 31 | 562 |  | 456 |
Employee future benefits |  |  |  |
Opening balance, Jan. 1 | (38 | ) | (46 | )
Net actuarial gains (losses) on defined benefit plans, net of tax(4) | (6 | ) | 8 |
Balance, Dec. 31 | (44 | ) | (38 | )
Other |  |  |  |
Opening balance, Jan. 1 | (18 | ) | (3 | )
Change in ownership of TransAlta Renewables | 4 |  | — |
Intercompany available-for-sale investments | 11 |  | (15 | )
Balance, Dec. 31 | (3 | ) | (18 | )
Accumulated other comprehensive income | 489 |  | 399 |
(1) Net of income tax of 11 million for the year ended Dec. 31, 2017 (2016 - 11 million ). (2) Net of income tax of 4 million for the year ended Dec. 31, 2017 (2016 - 5 million ). (3) Net of income tax of 108 million for the year ended Dec. 31, 2017 (2016 - 51 million ). (4) Net of income tax of 4 million for the year ended Dec. 31, 2017 (2016 - 4 million ).

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- Definition The entire disclosure of the analysis of other comprehensive income by item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106A&doctype=Standard -URIDate 2017-03-09 + Details
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