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Consolidated Statements of Changes in Equity - CAD ($)
$ in Millions
Total
Common shares
Preferred shares
Contributed surplus
Deficit
Other reserves [member]
Accumulated other comprehensive income
 [1]
Attributable to shareholders
Attributable to non-controlling interests
Common shares
Common shares
Deficit
Common shares
Attributable to shareholders
Preferred shares
Preferred shares
Deficit
Preferred shares
Attributable to shareholders
Balance, beginning of year at Dec. 31, 2016 $ 4,663 $ 3,094 $ 942 $ 9 $ (933)   $ 399 $ 3,511 $ 1,152            
Net earnings (loss) (118)       (160)     (160) 42            
Other comprehensive income (loss)                              
Net losses on translating net assets of foreign operations, net of hedges and of tax (25)           (25) (25)              
Net gains on derivatives designated as cash flow hedges, net of tax 106           106 106 0            
Net actuarial gains on defined benefits plans, net of tax (6)           (6) (6)              
Intercompany available-for-sale investments 0         $ 11 11 11 (11)            
Total comprehensive income (43)       (160)   86 (74) 31            
Share dividends (Note 24) (30)                 $ (34) $ (34) $ (34) $ (30) $ (30) $ (30)
Changes in non-controlling interests in TransAlta Renewables (Note 4) 0       (52)   4 (48) 48            
Effect of share-based payment plans 1     1       1              
Distributions paid, and payable, to non-controlling interests (172)               (172)            
Balance, end of year at Dec. 31, 2017 4,385 3,094 942 10 (1,209)   489 3,326 1,059            
Net earnings (loss) (90)       (198)     (198) 108            
Other comprehensive income (loss)                              
Net losses on translating net assets of foreign operations, net of hedges and of tax 43           43 43              
Net gains on derivatives designated as cash flow hedges, net of tax (54)           (54) (54)              
Net actuarial gains on defined benefits plans, net of tax 15           15 15              
Intercompany fair value through other comprehensive income investments 0         (16) [1]   (16) 16            
Total comprehensive income (86)       (198)   (12) (210) 124            
Share dividends (Note 24) (50)                 $ (57) $ (57) $ (57) $ (50) $ (50) $ (50)
Changes in non-controlling interests in TransAlta Renewables (Note 4) 157       20 $ 4 [1]   24 133            
Effect of share-based payment plans 1     1       1              
Distributions paid, and payable, to non-controlling interests (180)               (180)            
Shares purchased under NCIB (23) (35)     12     (23)              
Balance, end of year at Dec. 31, 2018 $ 4,134 $ 3,059 $ 942 $ 11 $ (1,496)   $ 481 $ 2,997 $ 1,137            
[1] (1) Refer to Note 26 for details on components of, and changes in, accumulated other comprehensive income (loss).