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Accumulated Other Comprehensive Income (Loss) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period $ 146    
Currency translation adjustment      
Losses (gains) on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax 4 $ 14  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax [1] (25) 0 $ 11
Cash flow hedges      
Losses on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax [2] (556) (200) 20
Other      
Intercompany and third-party investments at FVTOCI (1) 0  
Accumulated other comprehensive income, end of the period (222) 146  
Net income tax expense (recovery) relating to gains (losses) on financial instruments (3) 0 0
Net impact related to cash flow hedges 112 57 23
Net of income tax expense (12) (11) 3
Currency translation adjustment      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (35) (21)  
Currency translation adjustment      
Losses (gains) on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax 21 (14)  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax (25) 0  
Other      
Accumulated other comprehensive income, end of the period (39) (35) (21)
Cash flow hedges      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 228 436  
Cash flow hedges      
Losses on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax (456) (208)  
Other      
Accumulated other comprehensive income, end of the period (228) 228 436
Net impact related to cash flow hedges (112) (57)  
Employee future benefits      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (29) (66)  
Employee future benefits      
Net actuarial gains on defined benefit plans, net of tax 37 37  
Other      
Accumulated other comprehensive income, end of the period 8 (29) (66)
Net of income tax expense 12 11  
Other      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (18) (47)  
Other      
Intercompany and third-party investments at FVTOCI 55 29  
Accumulated other comprehensive income, end of the period $ 37 $ (18) $ (47)
[1] Net of income tax recovery of $3 million for the year ended Dec. 31, 2022 (2021 and 2020 – nil).
[2] Net of income tax recovery of $138 million for the year ended Dec. 31, 2022 (2021 – $55 million recovery, 2020 – $8 million expense).