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BORROWINGS - Corporate Borrowings (Details)
$ in Millions
 12 Months Ended
Apr. 25, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nov. 29, 2024
USD ($)
Nov. 29, 2024
CAD ($)
Jun. 05, 2024
USD ($)
Jun. 05, 2024
CAD ($)
May 31, 2024
USD ($)
May 31, 2024
CAD ($)
Feb. 22, 2024
USD ($)
Jul. 27, 2023
CAD ($)
Nov. 14, 2022
CAD ($)
Apr. 25, 2022
CAD ($)
Disclosure of detailed information about borrowings [line items]                            
Credit facility, maximum borrowing capacity   $ 458,000,000                        
Deferred financing costs and other   (29,000,000) $ (21,000,000)                      
Current and non-current portion of corporate borrowings   4,542,000,000 4,911,000,000                      
Notional amount   21,604,000,000 21,276,000,000                      
Line of credit, amount drawn   78,000,000                        
Repayment of corporate borrowings   (531,000,000) 0 $ 0                    
Net (repayment) proceeds from commercial paper program   139,000,000 (525,000,000) $ (33,000,000)                    
Senior Unsecured Revolving Credit Facility                            
Disclosure of detailed information about borrowings [line items]                            
Credit facility, maximum borrowing capacity   $ 2,200,000,000 2,200,000,000                      
Basis points   0.0013                        
Total     222,000,000                      
Letter of credit outstanding amount   $ 10,000,000 8,000,000                      
Senior Unsecured Revolving Credit Facility | Floating interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Borrowings, adjustment to interest rate basis   1.20%                        
Corporate revolving credit facility                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 300,000,000 222,000,000                      
Corporate revolving credit facility | Floating interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Borrowings, adjustment to interest rate basis   1.20%                        
Commercial Paper                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 850,000,000 989,000,000                      
Commercial Paper | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   5.00%                        
Medium Term Notes, Public - Canadian - Maturing February 22, 2024                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 0 226,000,000               $ 531,000,000      
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   3.30%                 3.315%      
Medium Term Notes, Public - Canadian - Maturing February 22, 2024                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 0 302,000,000                      
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   3.30%                        
Medium-term Notes, Maturing November 31, 2027                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 313,000,000 340,000,000                      
Medium-term Notes, Maturing November 31, 2027 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   5.60%                        
Medium-term Notes, Maturing September 11, 2028                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 487,000,000 528,000,000                      
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   4.20%                        
Medium-term Notes, Maturing October 9, 2029                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 487,000,000 528,000,000                      
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   3.40%                        
Medium-term Notes, Maturing July 27, 2030                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 348,000,000 377,000,000                      
Notional amount                       $ 700    
Medium-term Notes, Maturing July 27, 2030 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   5.70%                        
Medium-term Notes, Maturing July 27, 2030 Tranche One                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount                       $ 500    
Medium-term Notes, Maturing July 27, 2030 Tranche One | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate                       5.71%    
Medium-term Notes, Maturing July 27, 2030 Tranche Two                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount                       $ 200    
Medium-term Notes, Maturing July 27, 2030 Tranche Two | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate                       5.95%    
Medium-term Notes, Maturing September 1, 2032                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 348,000,000 377,000,000                      
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   2.90%                        
Medium-term Notes, Maturing February 13, 2033                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 174,000,000 189,000,000                      
Medium-term Notes, Maturing February 13, 2033 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   6.00%                        
Medium-term Notes, Maturing April 25, 2034                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 278,000,000 302,000,000                      
Notional amount                           $ 600
Finance costs $ 3,000,000                          
Medium-term Notes, Maturing April 25, 2034 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   5.40%                        
Medium-term Notes, Maturing April 25, 2052                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 139,000,000 151,000,000                      
Medium-term Notes, Maturing April 25, 2052 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   5.80%                        
Medium-term Notes, Maturing July 27, 2053                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 139,000,000 151,000,000                      
Medium-term Notes, Maturing July 27, 2053 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   6.00%                        
Subordinated notes, Maturing March 15, 2055                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 300,000,000 0   $ 300,000,000                  
Annual rate   6.80%                        
Notional amount           $ 300                
Subordinated notes, Maturing March 15, 2055 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   6.80%     6.80% 6.80%                
Subordinated notes, Maturing 2081                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 250,000,000 $ 250,000,000                      
Annual rate   5.00% 5.00%                      
Subordinated notes, Maturing 2081 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   5.00%                        
Subordinated notes, Maturing May 31, 2084                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 158,000,000 $ 0       $ 158,000,000   $ 158,000,000          
Annual rate   7.30%                        
Notional amount               $ 8   $ 150        
Subordinated notes, Maturing May 31, 2084 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate   7.30%         7.30% 7.30% 7.25% 7.25%        
Corporate borrowings                            
Disclosure of detailed information about borrowings [line items]                            
Total   $ 4,571,000,000 4,932,000,000                      
Increase (decrease) in corporate borrowings   (369,000,000)                        
Subordinated notes, Maturing March 15, 2030 | Floating interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Borrowings, variable rate         2.453% 2.453%                
Revolving credit facility with Brookfield                            
Disclosure of detailed information about borrowings [line items]                            
Credit facility, maximum borrowing capacity   1,000,000,000 1,000,000,000                      
Total   $ 0 $ 0                      
Borrowings, term   1 year                        
Revolving credit facility with Brookfield | Floating interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Borrowings, adjustment to interest rate basis   1.90%                        
Medium-term Notes, Maturing November 14, 2027                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount                         $ 700  
Medium-term Notes, Maturing November 14, 2027 Tranche One                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount                         $ 450  
Medium-term Notes, Maturing November 14, 2027 Tranche One | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate                         5.60%  
Medium-term Notes, Maturing November 14, 2027 Tranche Two                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount                         $ 250  
Medium-term Notes, Maturing November 14, 2027 Tranche Two | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate                         6.00%  
Medium-term Notes, Maturing April 25, 2034 Tranche One                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount                           $ 400
Medium-term Notes, Maturing April 25, 2034 Tranche One | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate                           5.40%
Medium-term Notes, Maturing April 25, 2034 Tranche Two                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount                           $ 200
Medium-term Notes, Maturing April 25, 2034 Tranche Two | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual rate                           5.80%