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BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - Non-recourse borrowings - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings $ 13,113 $ 8,063
Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 13,206  
Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (93)  
2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 996  
2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 806  
2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 835  
2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 762  
2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,523  
Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6,284  
Utilities    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 5,397 3,649
Utilities | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 5,412  
Utilities | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (15)  
Utilities | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 98  
Utilities | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 348  
Utilities | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 501  
Utilities | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 205  
Utilities | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,252  
Utilities | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,008  
Transport    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,444 3,257
Transport | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,448  
Transport | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (4)  
Transport | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 233  
Transport | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 205  
Transport | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 307  
Transport | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 340  
Transport | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 340  
Transport | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 2,023  
Energy    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,155 1,157
Energy | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 3,209  
Energy | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (54)  
Energy | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 82  
Energy | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 247  
Energy | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 11  
Energy | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 211  
Energy | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 925  
Energy | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,733  
Data Infrastructure [Member]    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,117 $ 0
Data Infrastructure [Member] | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 1,137  
Data Infrastructure [Member] | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings (20)  
Data Infrastructure [Member] | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 583  
Data Infrastructure [Member] | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6  
Data Infrastructure [Member] | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 16  
Data Infrastructure [Member] | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6  
Data Infrastructure [Member] | 2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings 6  
Data Infrastructure [Member] | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Non-recourse borrowings $ 520