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BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - Non-recourse borrowings - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings $ 20,020 $ 18,544
Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 20,177  
Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (157)  
2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,052  
2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 881  
2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,767  
2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,015  
2025 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,554  
Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 9,908  
Utilities    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 8,067 7,213
Utilities | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 8,100  
Utilities | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (33)  
Utilities | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 486  
Utilities | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 351  
Utilities | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,676  
Utilities | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,370  
Utilities | 2025 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 783  
Utilities | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,434  
Transport    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6,635 8,210
Transport | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6,680  
Transport | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (45)  
Transport | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 431  
Transport | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 454  
Transport | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 330  
Transport | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 391  
Transport | 2025 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 928  
Transport | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 4,146  
Midstream    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,111 2,198
Midstream | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,153  
Midstream | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (42)  
Midstream | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 10  
Midstream | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 11  
Midstream | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 510  
Midstream | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 10  
Midstream | 2025 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,088  
Midstream | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 524  
Data    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,207 $ 923
Data | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,244  
Data | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (37)  
Data | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 125  
Data | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 65  
Data | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 251  
Data | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 244  
Data | 2025 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 755  
Data | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings $ 1,804