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Accumulated Other Comprehensive Earnings (Details) - CAD ($)
$ in Millions
 12 Months Ended
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).