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Other Long-Term Liabilities - Share-Based Compensation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]      
Balance – beginning of year $ 160 $ 297 $ 124
Share-based compensation expense (recovery) 514 (82) 223
Cash payment for stock options surrendered and PSUs vested (48) (39) (2)
Transferred to common shares (139) (21) (53)
Other 2 5 5
Balance – end of year 489 160 297
Less: current portion 329 119 227
Non-current liabilities from share-based payment arrangements 160 41 70
Performance Share Units | Certain Executives      
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]      
Balance – beginning of year 49 62  
Balance – end of year $ 90 $ 49 $ 62