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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 |

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