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Accumulated Other Comprehensive Loss (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | $ (222) |  |
Currency translation adjustment |  |  |  |
(Losses) gains on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax |  | (3) | $ 4 |
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax | [1] | 9 | (25) | $ 0
Cash flow hedges |  |  |  |
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax | [2] | 41 | (556) | (200)
Other |  |  |  |
Intercompany and third-party investments at FVTOCI |  | 0 | (1) |
Accumulated other comprehensive income, end of the period |  | (164) | (222) |
Net income tax expense (recovery) relating to gains (losses) on financial instruments |  | 1 | (3) | 0
Net impact related to cash flow hedges |  | 27 | (112) | (57)
Net of income tax expense |  | 1 | (12) | (11)
Currency translation adjustment |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | (39) | (35) |
Currency translation adjustment |  |  |  |
(Losses) gains on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax |  | (6) | 21 |
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax |  | 9 | (25) |
Other |  |  |  |
Accumulated other comprehensive income, end of the period |  | (36) | (39) | (35)
Cash flow hedges |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | (228) | 228 |
Cash flow hedges |  |  |  |
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax |  | 99 | (456) |
Other |  |  |  |
Accumulated other comprehensive income, end of the period |  | (129) | (228) | 228
Net impact related to cash flow hedges |  | (27) | 112 |
Employee future benefits |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | 8 | (29) |
Employee future benefits |  |  |  |
Net actuarial gains on defined benefit plans, net of tax |  | (5) | 37 |
Other |  |  |  |
Accumulated other comprehensive income, end of the period |  | 3 | 8 | (29)
Net of income tax expense |  | (1) | 12 |
Other |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | 37 | (18) |
Other |  |  |  |
Change in ownership of TransAlta Renewables |  | (64) |  |
Intercompany and third-party investments at FVTOCI |  | 25 | 55 |
Accumulated other comprehensive income, end of the period |  | $ (2) | $ 37 | $ (18)
[1] | Net of income tax expense of $1 million for the year ended Dec. 31, 2023 (2022 – $3 million recovery, 2021 – nil).
[2] | Net of income tax expense of $10 million for the year ended Dec. 31, 2023 (2022 – $138 million recovery, 2021 – $55 million recovery).

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