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Share Capital and Warrants - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Feb. 13, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Nov. 07, 2022
Nov. 04, 2021
Disclosure of classes of share capital [Line Items]                            
Maximum percentage of preferred stock upon issuance or outstanding of common stock                   20.00%        
NCIB, shares redeemed, amount                   $ 2,530.0 $ 265.0 $ 0.0    
NCIB, reduction to contributed surplus                   $ 1,571.0 $ 120.0      
Preference shares                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   36,000,000       36,000,000       36,000,000 36,000,000      
Issued capital   $ 519.0       $ 519.0       $ 519.0 $ 519.0      
Dividend Rate   5.05% 3.21% 2.35% 1.86% 1.92% 1.84% 1.80% 1.84%          
Preference shares | Series 1 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   10,740,000               10,740,000        
Dividend Rate                   2.58%        
Preference shares | Series 1 First Preferred Shares | Government of Canada Bond                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   173.00%               173.00%        
Preference shares | Series 2 First Preferred Shares (1)                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   1,260,000               1,260,000        
Dividend Rate                   5.86%        
Preference shares | Series 2 First Preferred Shares (1) | 90-Day Government of Canada Treasury Bills                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   173.00%               173.00%        
Preference shares | Series 3 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   10,000,000               10,000,000        
Dividend Rate                   4.69%        
Preference shares | Series 3 First Preferred Shares | Government of Canada Bond                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   313.00%               313.00%        
Preference shares | Series 5 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   8,000,000               8,000,000        
Dividend Rate                   4.59%        
Preference shares | Series 5 First Preferred Shares | Government of Canada Bond                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   357.00%               357.00%        
Preference shares | Series 7 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   6,000,000               6,000,000        
Dividend Rate                   3.94%        
Preference shares | Series 7 First Preferred Shares | Government of Canada Bond                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   352.00%               352.00%        
Preference shares | First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Redeemable preferred shares, conversion term                   5 years        
Redeemable preferred shares, price per share                   $ 25.00        
Preference shares | Series 1 And 2 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Redeemable preferred shares, conversion term                   5 years        
Preference shares | Series 3 and 4 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Redeemable preferred shares, conversion term                   5 years        
Preference shares | Series 5 and 6 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Redeemable preferred shares, conversion term                   5 years        
Preference shares | Series 7 and 8 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Redeemable preferred shares, conversion term                   5 years        
Preference shares | Series 1, 3, 5, 7 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Redeemable preferred shares, conversion term                   5 years        
Preference shares | Series 4 First Preferred Shares | 90-Day Government of Canada Treasury Bills                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   313.00%               313.00%        
Preference shares | Series 6 First Preferred Shares | 90-Day Government of Canada Treasury Bills                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   357.00%               357.00%        
Preference shares | Series 8 First Preferred Shares | 90-Day Government of Canada Treasury Bills                            
Disclosure of classes of share capital [Line Items]                            
Dividend rate, basis spread   352.00%               352.00%        
Preference shares | Series 2,4,6,8 First Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Redeemable preferred shares, price per share                   $ 25.50        
Second Preferred Shares                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   0       0       0 0      
Common shares                            
Disclosure of classes of share capital [Line Items]                            
NCIB, reduction to contributed surplus                   $ 1,571.0 $ 120.0      
Purchase of Common Shares under NCIBs                   112,489,000 17,026,000      
Shares outstanding (in shares)   1,909,190,000       2,001,211,000       1,909,190,000 2,001,211,000 1,228,870,000    
Issued capital   $ 16,320.0       $ 17,016.0       $ 16,320.0 $ 17,016.0 $ 11,040.0    
Common shares | Original NCIB                            
Disclosure of classes of share capital [Line Items]                            
NCIB, shares authorized for repurchase (in shares)                           146,500,000
NCIB, shares repurchased, price per share (in CAD per share)                   $ 22.49 $ 15.56      
NCIB, shares redeemed, amount                   $ 2,500.0 $ 265.0      
NCIB, reduction to contributed surplus                   $ 1,600.0 $ 120.0      
Common shares | Renewed NCIB                            
Disclosure of classes of share capital [Line Items]                            
NCIB, shares authorized for repurchase (in shares)                         136,700,000  
Common shares | Renewed NCIB | Potential ordinary share transactions                            
Disclosure of classes of share capital [Line Items]                            
NCIB, shares authorized for repurchase (in shares) 123,800,000                          
NCIB, shares redeemed, amount $ 36.8                          
Purchase of Common Shares under NCIBs 1,400,000                          
Common Share Warrants                            
Disclosure of classes of share capital [Line Items]                            
Shares outstanding (in shares)   55,720,000       65,119,000       55,720,000 65,119,000 0    
Issued capital   $ 184.0       $ 215.0       $ 184.0 $ 215.0 $ 0.0    
Exercise price of warrants issued (in CAD per share)                   $ 6.54        
Stock Option Plan                            
Disclosure of classes of share capital [Line Items]                            
Shares available for future issuance (in shares)   43,000,000       30,000,000       43,000,000 30,000,000