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Shareholders' Capital (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
CAD ($)
shares
vote
Dec. 31, 2020
CAD ($)
shares
Number of Common Shares    
Vesting of share awards (in shares) | shares 3,013,000 2,922,000
Changes in equity [abstract]    
Beginning balance | $ $ 578,213 $ 2,947,209
Vesting of share awards | $ 6,389 7,216
Ending balance | $ $ 2,211,329 $ 578,213
Shareholders’ capital    
Number of Common Shares    
Beginning balance (in shares) | shares 561,227,000 558,305,000
Vesting of share awards (in shares) | shares 2,986,000 2,922,000
Ending balance (in shares) | shares 564,213,000 561,227,000
Changes in equity [abstract]    
Beginning balance | $ $ 5,729,418 $ 5,718,835
Vesting of share awards | $ 7,175 10,583
Ending balance | $ $ 5,736,593 $ 5,729,418
Preference shares    
Preferred shares without nominal or par value (in shares) | shares 10,000,000  
Issued on corporate acquisition (in shares) | shares 0  
Ordinary shares    
Voting rights, votes per share | vote 1