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Accumulated Other Comprehensive Income (Notes) | 12 Months Ended
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Dec. 31, 2018
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:
| 2019 | 2018
Currency translation adjustment |  |
Opening balance, Jan. 1 | 17 |  | (26) |
Gains (losses) on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax | (59) |  | 84 |
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax | 21 |  | (41) |
Balance, Dec. 31 | (21) |  | 17 |
Cash flow hedges |  |
Opening balance, Jan. 1 | 508 |  | 562 |
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax(1) | 19 |  | (54) |
Balance, Dec. 31 | 527 |  | 508 |
Employee future benefits |  |
Opening balance, Jan. 1 | (29) |  | (44) |
Net actuarial gains (losses) on defined benefit plans, net of tax(2) | (26) |  | 15 |
Balance, Dec. 31 | (55) |  | (29) |
Other |  |
Opening balance, Jan. 1 | (15) |  | (3) |
Change in ownership of TransAlta Renewables | 1 |  | 4 |
Intercompany investments at FVOCI | 17 |  | (16) |
Balance, Dec. 31 | 3 |  | (15) |
Accumulated other comprehensive income | 454 |  | 481 |
(1) Net of income tax of $6 million for the year ended Dec. 31, 2019 (2018 - $12 million). (2) Net of income tax of $7 million for the year ended Dec. 31, 2019 (2018 - $5 million).

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