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LONG-TERM DEBT - Senior Notes and Debentures (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 12 Months Ended
Jan. 09, 2023
CAD ($)
Jan. 09, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Mar. 11, 2022
CAD ($)
Feb. 11, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 17, 2021
CAD ($)
Dec. 31, 2022
CAD ($)
Sep. 30, 2022
CAD ($)
Sep. 30, 2022
USD ($)
Feb. 28, 2022
CAD ($)
$ / shares
shares
Feb. 28, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
CAD ($)
Mar. 31, 2022
USD ($)
Mar. 11, 2022
USD ($)
Feb. 28, 2022
USD ($)
shares
Feb. 11, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]                                          
Other directly attributable transaction sosts               $ 262,000,000 $ 557,000,000                        
Restricted cash and cash equivalents     $ 12,837,000,000     $ 0   12,837,000,000         $ 12,837,000,000 $ 0              
Subsequent Event                                          
Disclosure of detailed information about borrowings [line items]                                          
Consent fee $ 262,000,000                                        
Other directly attributable transaction sosts $ 55,000,000 $ 152,000,000                                      
Debt derivatives                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     1,019,000,000         $ 1,019,000,000         1,019,000,000                
Settlement amount                         $ 75,000,000                
Debt derivatives | Cash flow hedges                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount           8,930,000,000               8,930,000,000             $ 6,950,000,000
Series I Preferred Shares | Major ordinary share transactions                                          
Disclosure of detailed information about borrowings [line items]                                          
Number of shares authorized for issue (in shares) | shares                     3.3               3.3    
Par value per share | $ / shares                     $ 1,000                    
Series II Preferred Shares | Major ordinary share transactions                                          
Disclosure of detailed information about borrowings [line items]                                          
Number of shares authorized for issue (in shares) | shares                     1.4               1.4    
Par value per share | $ / shares                     $ 1,000                    
Senior Notes Due 2082                                          
Disclosure of detailed information about borrowings [line items]                                          
Maturity (in years)                         5 years                
Senior Notes Due 2082 | Debt derivatives | Cash flow hedges | Interest rate risk | Entering into significant commitments or contingent liabilities [member]                                          
Disclosure of detailed information about borrowings [line items]                                          
Notional amount terminated                                     $ 950,000,000    
Senior Notes Due 2082 | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                                       $ 750,000,000  
Interest rate                                       5.25%  
Total gross proceeds         $ 951,000,000                                
Transaction costs and discounts     $ 0   13,000,000                                
Senior Notes Due 2082 | Fixed interest rate | Entering into significant commitments or contingent liabilities [member]                                          
Disclosure of detailed information about borrowings [line items]                                          
Total gross proceeds                     $ 938,000,000 $ 740,000,000                  
Senior Notes Due 2082 | Floating interest rate | Entering into significant commitments or contingent liabilities [member]                                          
Disclosure of detailed information about borrowings [line items]                                          
Interest rate                     5.25%               5.25%    
Senior notes                                          
Disclosure of detailed information about borrowings [line items]                                          
Total gross proceeds                         $ 13,304,000,000 0              
Maturity (in years)                         5 years                
Senior Notes Due 2025 - 2.950% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                             $ 1,000,000,000     $ 1,000,000,000      
Interest rate     2.95% 2.95%       2.95%         2.95%   2.95%     2.95%      
Discount / premium at issuance       99.934%                           99.934%      
Total gross proceeds       $ 1,283,000,000                                  
Transaction costs and discounts     $ 50,000,000 9,000,000                                  
Senior Notes Due 2025 - 3.100% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 1,250,000,000 $ 1,250,000,000       $ 1,250,000,000         $ 1,250,000,000                
Interest rate     3.10% 3.10%       3.10%         3.10%   3.10%     3.10%      
Discount / premium at issuance       99.924%                           99.924%      
Total gross proceeds       $ 1,250,000,000                                  
Transaction costs and discounts     $ 0 $ 7,000,000                                  
Senior Notes Due 2027 - 3.200% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                             $ 1,300,000,000     $ 1,300,000,000      
Interest rate     3.20% 3.20%       3.20%         3.20%   3.20%     3.20%      
Discount / premium at issuance       99.991%                           99.991%      
Total gross proceeds       $ 1,674,000,000                                  
Transaction costs and discounts     $ 82,000,000 13,000,000                                  
Senior Notes Due 2029 - 3.750% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 1,000,000,000 $ 1,000,000,000       $ 1,000,000,000         $ 1,000,000,000                
Interest rate     3.75% 3.75%       3.75%         3.75%   3.75%     3.75%      
Discount / premium at issuance       99.891%                           99.891%      
Total gross proceeds       $ 1,000,000,000                                  
Transaction costs and discounts     $ 57,000,000 $ 7,000,000                                  
Senior Notes Due 2032 - 3.800% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                             $ 2,000,000,000     $ 2,000,000,000      
Interest rate     3.80% 3.80%       3.80%         3.80%   3.80%     3.80%      
Discount / premium at issuance       99.777%                           99.777%      
Total gross proceeds       $ 2,567,000,000                                  
Transaction costs and discounts     $ 165,000,000 27,000,000                                  
Senior Notes Due 2032 - 4.250% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 1,000,000,000 $ 1,000,000,000       $ 1,000,000,000         $ 1,000,000,000                
Interest rate     4.25% 4.25%       4.25%         4.25%   4.25%     4.25%      
Discount / premium at issuance       99.987%                           99.987%      
Total gross proceeds       $ 1,000,000,000                                  
Transaction costs and discounts     $ 58,000,000 $ 6,000,000                                  
Senior Notes Due 2042 | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                             $ 750,000,000     $ 750,000,000      
Interest rate     4.50% 4.50%       4.50%         4.50%   4.50%     4.50%      
Discount / premium at issuance       98.997%                           98.997%      
Total gross proceeds       $ 966,000,000                                  
Transaction costs and discounts     $ 95,000,000 $ 20,000,000                                  
Senior Notes Due 2052 - 4.550% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                             $ 2,000,000,000     $ 2,000,000,000      
Interest rate     4.55% 4.55%       4.55%         4.55%   4.55%     4.55%      
Discount / premium at issuance       98.917%                           98.917%      
Total gross proceeds       $ 2,564,000,000                                  
Transaction costs and discounts     $ 250,000,000 55,000,000                                  
Senior Notes Due 2052 - 5.250% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 1,000,000,000 $ 1,000,000,000       $ 1,000,000,000         $ 1,000,000,000                
Interest rate     5.25% 5.25%       5.25%         5.25%   5.25%     5.25%      
Discount / premium at issuance       99.483%                           99.483%      
Total gross proceeds       $ 1,000,000,000                                  
Transaction costs and discounts     $ 62,000,000 $ 12,000,000                                  
Senior Notes Due 2081                                          
Disclosure of detailed information about borrowings [line items]                                          
Maturity (in years)                         5 years                
Senior Notes Due 2081 | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 2,000,000,000       $ 2,000,000,000 $ 2,000,000,000     $ 750,000,000   $ 2,000,000,000                
Interest rate     5.00%       5.00% 5.00%         5.00%   5.00%            
Total gross proceeds             $ 2,000,000,000                            
Transaction costs and discounts           0 $ 20,000,000                            
Senior Notes Issued In March                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                               $ 13,300,000,000          
Senior Notes Issued In March 1                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                               9,050,000,000.00 $ 7,050,000,000.00   $ 750,000,000    
Senior Notes Issued In March 2                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount                               $ 4,250,000,000          
Senior Notes Due 2022                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount           $ 1,450,000,000               $ 1,450,000,000              
Interest rate           5.34%               5.34%             5.34%
Maturity (in years)                         5 years                
Senior Notes Due 2022 | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 600,000,000         $ 600,000,000         $ 600,000,000                
Interest rate     4.00%         4.00%         4.00%   4.00%            
Senior Notes Due 2022 | Floating interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 750,000,000         $ 750,000,000         $ 750,000,000   $ 750,000,000     $ 1,000,000,000   $ 750,000,000  
Spread on variable rate (as a percent)       2.95%                           2.95%   5.25%  
Senior Notes Due 2022 | Floating interest rate | Debt derivatives                                          
Disclosure of detailed information about borrowings [line items]                                          
Interest rate       2.991%                           2.991%   5.635%  
Total gross proceeds       $ 1,283,000,000 $ 951,000,000                                
Senior Notes Due 2027 - 3.650%                                          
Disclosure of detailed information about borrowings [line items]                                          
Maturity (in years)                         5 years                
Senior Notes Due 2027 - 3.650% | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 1,500,000,000         $ 1,500,000,000         $ 1,500,000,000                
Interest rate     3.65%         3.65%         3.65%   3.65%            
SMR Notes                                          
Disclosure of detailed information about borrowings [line items]                                          
Consent fee                 557,000,000                        
Other directly attributable transaction sosts                 $ 121,000,000 $ 331,000,000                      
Borrowings, Redemption Prices, Percentage                               101.00% 101.00%        
Restricted cash and cash equivalents                               $ 12,800,000,000          
Senior Notes Due 2022 | Fixed interest rate                                          
Disclosure of detailed information about borrowings [line items]                                          
Principal amount     $ 600,000,000         $ 600,000,000         $ 600,000,000                
Interest rate     4.00%         4.00%         4.00%   4.00%