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Accumulated Other Comprehensive Income | 12 Months Ended
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Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [abstract] |
Accumulated other comprehensive income | Accumulated Other Comprehensive Income The components of, and changes in, accumulated other comprehensive income (loss) are as follows:
| 2018 |  | 2017 |
Currency translation adjustment |  |
Opening balance, Jan. 1 | (26 | ) | (1 | )
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax(1) | 84 |  | (89 | )
Gains on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax(2) | (41 | ) | 64 |
Balance, Dec. 31 | 17 |  | (26 | )
Cash flow hedges |  |  |  |
Opening balance, Jan. 1 | 562 |  | 456 |
Gains on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax(3) | (54 | ) | 106 |
Balance, Dec. 31 | 508 |  | 562 |
Employee future benefits |  |  |  |
Opening balance, Jan. 1 | (44 | ) | (38 | )
Net actuarial gains (losses) on defined benefit plans, net of tax(4) | 15 |  | (6 | )
Balance, Dec. 31 | (29 | ) | (44 | )
Other |  |  |  |
Opening balance, Jan. 1 | (3 | ) | (18 | )
Change in ownership of TransAlta Renewables | 4 |  | 4 |
Intercompany investments at FVOCI | (16 | ) | 11 |
Balance, Dec. 31 | (15 | ) | (3 | )
Accumulated other comprehensive income | 481 |  | 489 |
(1) Net of income tax of nil for the year ended Dec. 31, 2018 (2017 - 11 million ). (2) Net of income tax of nil for the year ended Dec. 31, 2018 (2017 - 4 million ). (3) Net of income tax of 12 million for the year ended Dec. 31, 2018 (2017 - 108 million ). (4) Net of income tax of 5 million for the year ended Dec. 31, 2018 (2017 - 4 million ).

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