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Accumulated Other Comprehensive Earnings (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | $ 302 |  |  |
Currency translation adjustment |  |  |  |  |
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax |  | 14 |  |  |
Gains on financial instruments designated as hedges of foreign operations, net of tax |  | 0 |  | $ 11 | $ 21
Cash flow hedges |  |  |  |  |
Gains (losses) on derivatives designated as cash flow hedges, net of tax | [1] | (200) |  | 20 | 61
Other |  |  |  |  |
Intercompany FVOCI investments |  | 0 |  | 0 |
Accumulated other comprehensive income, end of the period |  | 146 |  | 302 |
Net impact related to cash flow hedges |  | 57 |  | 23 | (6)
Income tax relating to net actuarial gains (losses) |  | (11) |  | 3 | 7
Reserve of exchange differences on translation |  |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | (21) |  | (21) |
Currency translation adjustment |  |  |  |  |
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax |  | (14) |  | (11) |
Gains on financial instruments designated as hedges of foreign operations, net of tax |  | 0 |  | 11 |
Other |  |  |  |  |
Accumulated other comprehensive income, end of the period |  | (35) |  | (21) | (21)
Reserve of cash flow hedges |  |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | 436 |  | 527 |
Cash flow hedges |  |  |  |  |
Gains (losses) on derivatives designated as cash flow hedges, net of tax |  | (208) |  | (91) |
Other |  |  |  |  |
Accumulated other comprehensive income, end of the period |  | 228 |  | 436 | 527
Net impact related to cash flow hedges |  | (57) |  | (23) |
Reserve of remeasurements of defined benefit plans |  |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | (66) |  | (55) |
Employee future benefits |  |  |  |  |
Net actuarial gains (losses) on defined benefit plans, net of tax |  | 37 |  | (11) |
Other |  |  |  |  |
Accumulated other comprehensive income, end of the period |  | (29) |  | (66) | (55)
Income tax relating to net actuarial gains (losses) |  | 11 |  | (3) |
Other reserves |  |  |  |  |
Components and changes in accumulated other comprehensive Income (loss) |  |  |  |  |
Accumulated other comprehensive income, beginning of the period |  | (47) |  | 3 |
Other |  |  |  |  |
Intercompany FVOCI investments |  | 29 | [2] | (50) |
Accumulated other comprehensive income, end of the period |  | $ (18) |  | $ (47) | $ 3
[1] | Net of income tax recovery of $55 million for the year ended Dec. 31, 2021 (2020 —$8 million expense, 2019 — $16 million expense).
[2] | Refer to Note 29 for details on components of, and changes in, accumulated other comprehensive earnings (loss).

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