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BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - Non-recourse borrowings - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings $ 18,544 $ 13,113
Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 18,676  
Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (132)  
2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,405  
2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,019  
2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,680  
2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,927  
2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,503  
Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 9,142  
Utilities    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 5,731 5,397
Utilities | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 5,726  
Utilities | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 5  
Utilities | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 463  
Utilities | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 418  
Utilities | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 330  
Utilities | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,936  
Utilities | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 830  
Utilities | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,749  
Transport    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6,544 3,444
Transport | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6,602  
Transport | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (58)  
Transport | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 362  
Transport | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 355  
Transport | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 489  
Transport | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 361  
Transport | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 560  
Transport | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 4,475  
Energy    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 5,346 3,155
Energy | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 5,406  
Energy | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (60)  
Energy | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 498  
Energy | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 240  
Energy | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 750  
Energy | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 618  
Energy | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,107  
Energy | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,193  
Data Infrastructure    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 923 $ 1,117
Data Infrastructure | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 942  
Data Infrastructure | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (19)  
Data Infrastructure | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 82  
Data Infrastructure | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6  
Data Infrastructure | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 111  
Data Infrastructure | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 12  
Data Infrastructure | 2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6  
Data Infrastructure | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings $ 725