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Consolidated Statements of Changes in Equity - 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
 [1]
Attributable to shareholders
Attributable to shareholders
Common shares
Attributable to shareholders
Preferred shares
Attributable to non-controlling interests
Balance, beginning of year at Dec. 31, 2019 $ 4,062     $ 2,978 $ 942 $ 42 $ (1,455)     $ 454 $ 2,961     $ 1,101
Changes in equity [abstract]                            
Net earnings (loss) (253)           (287)       (287)     34
Other comprehensive loss                            
Net losses on derivatives designated as cash flow hedges, net of tax (91)                 (91) (91)      
Net actuarial losses on defined benefits plans, net of tax (11)                 (11) (11)      
Intercompany FVOCI investments 0                 (50) (50)     50
Total comprehensive earnings (loss) (355)           (287)     (152) (439)     84
Dividends (49) $ (58) $ (49)         $ (58) $ (49)     $ (58) $ (49)  
Changes in non-controlling interests in TransAlta Renewables (Note 13) 20           5       5     15
Shares purchased under NCIB (61)     (79)     18       (61)      
Effect of share-based payment plans (Note 30) (7)     (3)   (4)         (7)      
Distributions paid, and payable, to non-controlling interests (116)                         (116)
Balance, end of year at Dec. 31, 2020 3,436     2,896 942 38 (1,826)     302 2,352     1,084
Changes in equity [abstract]                            
Net earnings (loss) (425)           (537)       (537)     112
Other comprehensive loss                            
Net losses on translating net assets of foreign operations, net of hedges and of tax (14)                 (14) (14)      
Net losses on derivatives designated as cash flow hedges, net of tax (208)                 (208) (208)     0
Net actuarial losses on defined benefits plans, net of tax 37                 37 37      
Intercompany FVOCI investments 0                   29     (29)
Total comprehensive earnings (loss) (610)           (537)     (156) (693)     83
Dividends (39) $ (51) $ (39)         $ (51) $ (39)     $ (51) $ (39)  
Effect of share-based payment plans (Note 30) 13     5   8         13      
Distributions paid, and payable, to non-controlling interests (156)                         (156)
Balance, end of year at Dec. 31, 2021 $ 2,593     $ 2,901 $ 942 $ 46 $ (2,453)     $ 146 $ 1,582     $ 1,011
[1] Refer to Note 29 for details on components of, and changes in, accumulated other comprehensive earnings (loss).