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BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - Non-recourse borrowings - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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 |

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