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Consolidated Statements of Changes in Equity Statement - CAD ($)
$ in Millions
Total
Common shares
Preferred shares
Issued capital
Common shares
Issued capital
Preferred shares
Contributed surplus
Deficit
Deficit
Common shares
Deficit
Preferred shares
Accumulated other comprehensive income
Attributable to shareholders
Attributable to shareholders
Common shares
Attributable to shareholders
Preferred shares
Attributable to non-controlling interests
Changes in equity [abstract]                            
Impact of change in accounting policy (Note 3) $ (13)           $ (14)       $ (14)     $ 1
Adjusted beginning balance 4,372     $ 3,094 $ 942 $ 10 (1,223)     $ 489 3,312     1,060
Balance, beginning of year at Dec. 31, 2017 4,385     3,094 942 10 (1,209)     489 [1] 3,326     1,059
Changes in equity [abstract]                            
Net earnings (loss) (90)           (198)       (198)     108
Other comprehensive income (loss)                            
Net gains on translating net assets of foreign operations, net of hedges and of tax 43                 43 [1] 43      
Net losses on derivatives designated as cash flow hedges, net of tax (54)                 (54) [1] (54)     0
Net actuarial gains on defined benefits plans, net of tax 15                 15 [1] 15      
Intercompany FVOCI investments 0                 (16) [1] (16)     16
Total comprehensive income (loss) (86)           (198)     (12) [1] (210)     124
Share dividends (Note 24) (50) $ (57) $ (50)         $ (57) $ (50)     $ (57) $ (50)  
Changes in non-controlling interests in TransAlta Renewables (Note 4(N) and 12) 157           20     4 [1] 24     133
Effect of share-based payment plans (Note 29) 1         1         1      
Shares purchased under NCIB (23)     (35)     12       (23)      
Distributions paid, and payable, to non-controlling interests (180)                         (180)
Balance, end of year at Dec. 31, 2018 4,134     3,059 942 11 (1,496)     481 [1] 2,997     1,137
Changes in equity [abstract]                            
Impact of change in accounting policy (Note 3) 3           3       3     0
Adjusted beginning balance 4,137     3,059 942 11 (1,493)     481 3,000     1,137
Net earnings (loss) 176           82       82     94
Other comprehensive income (loss)                            
Net gains on translating net assets of foreign operations, net of hedges and of tax (38)                 (38) [1] (38)      
Net losses on derivatives designated as cash flow hedges, net of tax 19                 19 [1] 19      
Net actuarial gains on defined benefits plans, net of tax (26)                 (26) [1] (26)      
Intercompany FVOCI investments 0                   17     (17)
Total comprehensive income (loss) 131           82     (28) [1] 54     77
Share dividends (Note 24) (30) $ (34) $ (30)         $ (34) $ (30)     $ (34) $ (30)  
Changes in non-controlling interests in TransAlta Renewables (Note 4(N) and 12) 28           5     1 [1] 6     22
Effect of share-based payment plans (Note 29) 33     2   31         33      
Shares purchased under NCIB (68)     (83)     15       (68)      
Distributions paid, and payable, to non-controlling interests (135)                         (135)
Balance, end of year at Dec. 31, 2019 $ 4,062     $ 2,978 $ 942 $ 42 $ (1,455)     $ 454 [1] $ 2,961     $ 1,101
[1] (1) Refer to Note 28 for details on components of, and changes in, accumulated other comprehensive income (loss).