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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
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 ).