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Share Capital and Warrants - Additional Information (Detail) - CAD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended
Jan. 01, 2021
Feb. 07, 2022
Dec. 31, 2021
Mar. 29, 2022
Dec. 29, 2021
Mar. 31, 2021
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 30, 2026
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               $ 265 $ 0 $ 0    
NCIB, reduction to contributed surplus               $ 120        
Stock Option Plan                        
Disclosure of classes of share capital [Line Items]                        
Shares available for future issuance (in shares)     30,000,000         30,000,000 27,000,000      
Preferred Shares                        
Disclosure of classes of share capital [Line Items]                        
Shares outstanding (in shares)     36,000,000         36,000,000 0      
Preferred Shares | Series 1 First Preferred Shares                        
Disclosure of classes of share capital [Line Items]                        
Preference shares converted from Series 1 to Series 2           274,000            
Redeemable preferred shares, conversion term             5 years          
Dividend Rate           2.40%   2.58%     2.58%  
Shares outstanding (in shares)     10,740,000         10,740,000        
Preferred Shares | Series 1 First Preferred Shares | Government of Canada Bond                        
Disclosure of classes of share capital [Line Items]                        
Dividend Rate                     0.85%  
Dividend rate, basis spread             1.73%          
Preferred Shares | Series 2 First Preferred Shares                        
Disclosure of classes of share capital [Line Items]                        
Dividend Rate       1.86% 1.92%     1.86%        
Preference shares converted from Series 2 to Series 1           578,000            
Shares outstanding (in shares)     1,260,000         1,260,000        
Preferred Shares | Series 2 First Preferred Shares | Government of Canada Bond                        
Disclosure of classes of share capital [Line Items]                        
Dividend rate, basis spread           1.73%            
Preferred Shares | Series 3 First Preferred Shares                        
Disclosure of classes of share capital [Line Items]                        
Redeemable preferred shares, conversion term               5 years        
Dividend Rate               4.69%        
Dividend yield, term two               5 years        
Shares outstanding (in shares)     10,000,000         10,000,000        
Preferred Shares | Series 3 First Preferred Shares | Government of Canada Bond                        
Disclosure of classes of share capital [Line Items]                        
Dividend rate, basis spread     3.13%         3.13%        
Preferred Shares | Series 3 First Preferred Shares | 90-Day Government of Canada Treasury Bills                        
Disclosure of classes of share capital [Line Items]                        
Dividend rate, basis spread     3.13%         3.13%        
Preferred Shares | Series 5 First Preferred Shares                        
Disclosure of classes of share capital [Line Items]                        
Redeemable preferred shares, conversion term               5 years        
Dividend Rate               4.59%        
Dividend yield, term two               5 years        
Shares outstanding (in shares)     8,000,000         8,000,000        
Preferred Shares | Series 5 First Preferred Shares | Government of Canada Bond                        
Disclosure of classes of share capital [Line Items]                        
Dividend rate, basis spread     3.57%         3.57%        
Preferred Shares | Series 5 First Preferred Shares | 90-Day Government of Canada Treasury Bills                        
Disclosure of classes of share capital [Line Items]                        
Dividend rate, basis spread     3.57%         3.57%        
Preferred Shares | Series 7 First Preferred Shares                        
Disclosure of classes of share capital [Line Items]                        
Redeemable preferred shares, conversion term               5 years        
Dividend Rate               3.94%        
Dividend yield, term two               5 years        
Shares outstanding (in shares)     6,000,000         6,000,000        
Preferred Shares | Series 7 First Preferred Shares | Government of Canada Bond                        
Disclosure of classes of share capital [Line Items]                        
Dividend rate, basis spread     3.52%         3.52%        
Preferred Shares | Series 7 First Preferred Shares | 90-Day Government of Canada Treasury Bills                        
Disclosure of classes of share capital [Line Items]                        
Dividend rate, basis spread     3.52%         3.52%        
Second Preferred Shares                        
Disclosure of classes of share capital [Line Items]                        
Shares outstanding (in shares)     0         0 0      
Share Purchase Warrants                        
Disclosure of classes of share capital [Line Items]                        
Shares outstanding (in shares)     65,119,000         65,119,000 0      
Exercise price of warrants issued (in CAD per share) $ 6.54                      
Common shares                        
Disclosure of classes of share capital [Line Items]                        
NCIB, shares authorized for repurchase (in shares)                       146,500,000
NCIB, shares repurchased (in shares)   9,000,000 17,000,000         17,026,000 0      
NCIB, shares repurchased, price per share (in CAD per share)     $ 15.56                  
NCIB, shares redeemed, amount   $ 160 $ 265                  
NCIB, reduction to contributed surplus     $ 120         $ 120        
Shares outstanding (in shares)     2,001,211,000         2,001,211,000 1,228,870,000 1,228,828,000