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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 (loss)
 [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, 2021 $ 2,593     $ 2,901 $ 942 $ 46 $ (2,453)     $ 146 $ 1,582     $ 1,011
Changes in equity [abstract]                            
Net earnings (loss) 161           50       50     111
Other comprehensive income (loss)                            
Net losses on translating net assets of foreign operations, net of hedges and tax (4)                 (4) (4)      
Net gains (losses) on derivatives designated as cash flow hedges, net of tax (456)                 (456) (456)     0
Net actuarial gains on defined benefits plans, net of tax 37                 37 37      
Intercompany FVTOCI investments (1)                 55 55     (56)
Total comprehensive income (loss) (263)           50     (368) (318)     55
Dividends (46) $ (57) $ (46)         $ (57) $ (46)     $ (57) $ (46)  
Shares purchased under NCIB (54)     (46)     (8)       (54)      
Effect of share-based payment plans 3     8   (5)         3      
Dividends recognised as distributions to non-controlling interests (187)                         (187)
Balance, end of year at Dec. 31, 2022 1,989     2,863 942 41 (2,514)     (222) 1,110     879
Changes in equity [abstract]                            
Net earnings (loss) 796           695       695     101
Other comprehensive income (loss)                            
Net losses on translating net assets of foreign operations, net of hedges and tax 3                 3 3      
Net gains (losses) on derivatives designated as cash flow hedges, net of tax 99                 99 99     0
Net actuarial gains on defined benefits plans, net of tax (5)                 (5) (5)      
Intercompany FVTOCI investments 0                 25 25     (25)
Total comprehensive income (loss) 893           695     122 817     76
Dividends (51) $ (65) $ (51)         $ (65) $ (51)     $ (65) $ (51)  
Shares purchased under NCIB (87)     (80)     (7)       (87)      
Changes in non-controlling interests in TransAlta Renewables (Note 4) (809)     510     (625)     (64) (179)     (630)
Provision for repurchase of shares under the automatic share purchase plan (19)     (19)             (19)      
Effect of share-based payment plans 11     11   0         11      
Dividends recognised as distributions to non-controlling interests (198)                         (198)
Balance, end of year at Dec. 31, 2023 $ 1,664     $ 3,285 $ 942 $ 41 $ (2,567)     $ (164) $ 1,537     $ 127
[1]
(1)Refer to Note 29 for details on components of and changes in, accumulated other comprehensive income (loss).