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Other Long-Term Liabilities - Share-Based Compensation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]      
Balance – beginning of year $ 489 $ 160 $ 297
Share-based compensation expense (recovery) 804 514 (82)
Cash payment for stock options surrendered and PSUs vested (79) (48) (39)
Transferred to common shares (387) (139) (21)
Other 5 2 5
Balance – end of year 832 489 160
Less: current portion 559 329 119
Non-current liabilities from share-based payment arrangements 273 160 41
Certain Executives | Performance Share Units      
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]      
Balance – beginning of year 90 49  
Balance – end of year $ 127 $ 90 $ 49