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BORROWINGS - Additional Information (Details)
$ in Millions
 12 Months Ended
May 24, 2021
USD ($)
Sep. 01, 2020
CAD ($)
Nov. 06, 2019
CAD ($)
Dec. 31, 2021
USD ($)
extension
Feb. 24, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 14, 2020
USD ($)
Apr. 07, 2020
CAD ($)
Oct. 07, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity       $ 1,131,000,000          
Commercial papers issued       431,000,000   $ 0      
Notional Amount (U.S. Dollars)       14,902,000,000   14,743,000,000      
Debt in breach of asset-level financial covenants       145,000,000          
Corporate revolving credit facility                  
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity       $ 1,975,000,000          
Basis points       0.0013          
Non-recourse borrowings       $ 0   1,131,000,000      
Letter of credit outstanding amount       $ 12,000,000   63,000,000      
Borrowings renewal period       1 year          
Borrowings renewal period, number of extensions available | extension       4          
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 Program                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 431,000,000   0      
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       0.37%          
Syndicated Revolving Credit Facility                  
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity       $ 1,000,000,000     $ 1,000,000,000    
Line of credit, amount drawn           0      
Syndicated Revolving Credit Facility | Bottom of range                  
Disclosure of detailed information about borrowings [line items]                  
Basis points             0.0042    
Syndicated Revolving Credit Facility | Top of range                  
Disclosure of detailed information about borrowings [line items]                  
Basis points             0.0044    
Syndicated Revolving Credit Facility | Floating interest rate | Bottom of range                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, adjustment to interest rate basis             2.10%    
Syndicated Revolving Credit Facility | Floating interest rate | Top of range                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, adjustment to interest rate basis             2.20%    
Medium-term Notes, Maturing October 9, 2029                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 554,000,000   550,000,000      
Notional Amount (U.S. Dollars)               $ 200 $ 500
Annual rate               3.40% 3.50%
Borrowings, effective interest rate               4.10%  
Medium-term Notes, Maturing October 9, 2029 | Debt Issuers                  
Disclosure of detailed information about borrowings [line items]                  
Amount repaid     $ 375            
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 October 9, 2029 | Fixed interest rate | Debt Issuers                  
Disclosure of detailed information about borrowings [line items]                  
Annual rate               3.40% 3.40%
Medium Term Notes                  
Disclosure of detailed information about borrowings [line items]                  
Notional Amount (U.S. Dollars)               $ 400  
Medium-term Notes, Maturing September 11, 2028                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 554,000,000   550,000,000      
Notional Amount (U.S. Dollars)               $ 200  
Borrowings, effective interest rate               4.10%  
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 September 11, 2028 | Fixed interest rate | Debt Issuers                  
Disclosure of detailed information about borrowings [line items]                  
Annual rate               4.20%  
Corporate borrowings                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 2,739,000,000   3,173,000,000      
Increase (decrease) in corporate borrowings       (434,000,000)          
Revolving credit facility with Brookfield                  
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity       500,000,000          
Non-recourse borrowings       $ 0   0      
Revolving credit facility with Brookfield | Floating interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, adjustment to interest rate basis       1.80%          
Commitment fees       $ 0          
Non-recourse borrowings                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       26,534,000,000   20,020,000,000      
Increase in borrowings       6,500,000,000          
Non-recourse borrowings | Disposal Group Disposed of By Sale Not Discontinued Operations                  
Disclosure of detailed information about borrowings [line items]                  
Increase in borrowings       8,700,000,000          
Non-recourse borrowings | Canadian diversified midstream operation                  
Disclosure of detailed information about borrowings [line items]                  
Increase in borrowings       6,700,000,000          
Non-recourse borrowings | CAD                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       9,257,000,000   2,400,000,000      
Non-recourse borrowings | USD                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       7,376,000,000   7,457,000,000      
Medium-term Notes, Maturing September 1, 2032                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 396,000,000   392,000,000      
Notional Amount (U.S. Dollars)   $ 500              
Amount repaid   $ 450              
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 September 1, 2032 | Fixed interest rate | Debt Issuers                  
Disclosure of detailed information about borrowings [line items]                  
Annual rate   2.90%              
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | CAD                  
Disclosure of detailed information about borrowings [line items]                  
Annual rate   2.90%              
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | USD                  
Disclosure of detailed information about borrowings [line items]                  
Annual rate   3.90%              
Subordinated Notes                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 250,000,000          
Subordinated notes, Maturing 2081                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings $ 250,000,000     $ 250,000,000   $ 0      
Annual rate 5.00%                
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%