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BORROWINGS - Corporate Borrowings (Details)
$ in Millions
 12 Months Ended
Nov. 14, 2022
USD ($)
Apr. 25, 2022
USD ($)
May 24, 2021
USD ($)
Dec. 31, 2022
USD ($)
renewal
Nov. 14, 2022
CAD ($)
Apr. 25, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Feb. 24, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]                
Credit facility, maximum borrowing capacity       $ 960,000,000        
Deferred financing costs and other       (23,000,000)     $ (20,000,000)  
Current and non-current portion of corporate borrowings       3,666,000,000     2,719,000,000  
Notional Amount (U.S. Dollars)       12,570,000,000     14,902,000,000  
Commercial papers issued       464,000,000     431,000,000  
Corporate Revolving Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Total       $ 96,000,000     0  
Corporate Revolving Credit Facility | Floating interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, adjustment to interest rate basis       1.20%        
Borrowings, adjustment to interest rate basis       1.20%        
Commercial Paper Program                
Disclosure of detailed information about borrowings [line items]                
Total       $ 464,000,000     431,000,000  
Commercial Paper Program | Establishment of Commercial Paper Program                
Disclosure of detailed information about borrowings [line items]                
Commercial papers issued               $ 500,000,000
Commercial Paper Program | 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       $ 222,000,000     237,000,000  
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, Public - Canadian - Maturing February 22, 2024                
Disclosure of detailed information about borrowings [line items]                
Total       $ 295,000,000     317,000,000  
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       $ 332,000,000     0  
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       $ 517,000,000     554,000,000  
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       $ 517,000,000     554,000,000  
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 September 1, 2032                
Disclosure of detailed information about borrowings [line items]                
Total       $ 369,000,000     396,000,000  
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       $ 185,000,000     0  
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       $ 295,000,000     0  
Notional Amount (U.S. Dollars)           $ 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       $ 147,000,000     0  
Medium-term Notes, Maturing April 25, 2052 | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Annual rate       5.80%        
Subordinated notes, Maturing 2081                
Disclosure of detailed information about borrowings [line items]                
Annual rate     5.00%          
Total     $ 250,000,000 $ 250,000,000     250,000,000  
Debt issuance costs     $ 6,000,000          
Subordinated notes, Maturing 2081 | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Annual rate       5.00%        
Corporate borrowings                
Disclosure of detailed information about borrowings [line items]                
Total       $ 3,689,000,000     2,739,000,000  
Increase (decrease) in corporate borrowings       947,000,000        
Corporate revolving credit facility                
Disclosure of detailed information about borrowings [line items]                
Credit facility, maximum borrowing capacity       $ 2,100,000,000     2,000,000,000  
Basis points       0.0013        
Total             0  
Letter of credit outstanding amount       $ 12,000,000     12,000,000  
Corporate revolving credit facility | Floating interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, adjustment to interest rate basis       1.20%        
Borrowings, adjustment to interest rate basis       1.20%        
Revolving credit facility with Brookfield                
Disclosure of detailed information about borrowings [line items]                
Credit facility, maximum borrowing capacity       $ 1,000,000,000     500,000,000  
Total       $ 0     $ 0  
Borrowings renewal | renewal       8        
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       1.80%        
Borrowings, adjustment to interest rate basis       1.80%        
Medium-term Notes, Maturing November 14, 2027                
Disclosure of detailed information about borrowings [line items]                
Notional Amount (U.S. Dollars)         $ 700      
Finance costs $ 2,000,000              
Medium-term Notes, Maturing November 14, 2027 Tranche One                
Disclosure of detailed information about borrowings [line items]                
Notional Amount (U.S. Dollars)         $ 450      
Medium-term Notes, Maturing November 14, 2027 Tranche One | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Annual rate         5.616%      
Medium-term Notes, Maturing November 14, 2027 Tranche Two                
Disclosure of detailed information about borrowings [line items]                
Notional Amount (U.S. Dollars)         $ 250      
Medium-term Notes, Maturing November 14, 2027 Tranche Two | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Annual rate         5.98%      
Medium-term Notes, Maturing April 25, 2034 Tranche One                
Disclosure of detailed information about borrowings [line items]                
Notional Amount (U.S. Dollars)           $ 400    
Medium-term Notes, Maturing April 25, 2034 Tranche One | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Annual rate           5.439%    
Medium-term Notes, Maturing April 25, 2034 Tranche Two                
Disclosure of detailed information about borrowings [line items]                
Notional Amount (U.S. Dollars)           $ 200    
Medium-term Notes, Maturing April 25, 2034 Tranche Two | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Annual rate           5.789%