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BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 10,164 $ 8,326
Non-recourse borrowings    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 8,063 7,324
Non-recourse borrowings | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 8,087  
Non-recourse borrowings | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings (24)  
Non-recourse borrowings | 2018 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 372  
Non-recourse borrowings | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 570  
Non-recourse borrowings | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 583  
Non-recourse borrowings | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 695  
Non-recourse borrowings | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 767  
Non-recourse borrowings | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 5,100  
Non-recourse borrowings | Utilities    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 3,649 3,207
Non-recourse borrowings | Utilities | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 3,650  
Non-recourse borrowings | Utilities | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings (1)  
Non-recourse borrowings | Utilities | 2018 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 0  
Non-recourse borrowings | Utilities | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 87  
Non-recourse borrowings | Utilities | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 304  
Non-recourse borrowings | Utilities | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 461  
Non-recourse borrowings | Utilities | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 440  
Non-recourse borrowings | Utilities | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 2,358  
Non-recourse borrowings | Transport    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 3,257 3,163
Non-recourse borrowings | Transport | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 3,262  
Non-recourse borrowings | Transport | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings (5)  
Non-recourse borrowings | Transport | 2018 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 143  
Non-recourse borrowings | Transport | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 261  
Non-recourse borrowings | Transport | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 210  
Non-recourse borrowings | Transport | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 230  
Non-recourse borrowings | Transport | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 323  
Non-recourse borrowings | Transport | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 2,095  
Non-recourse borrowings | Energy    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 1,157 $ 954
Non-recourse borrowings | Energy | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 1,175  
Non-recourse borrowings | Energy | Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings (18)  
Non-recourse borrowings | Energy | 2018 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 229  
Non-recourse borrowings | Energy | 2019 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 222  
Non-recourse borrowings | Energy | 2020 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 69  
Non-recourse borrowings | Energy | 2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 4  
Non-recourse borrowings | Energy | 2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings 4  
Non-recourse borrowings | Energy | Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 647