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Accumulated Other Comprehensive Income
 12 Months Ended
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 ).