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BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - Non-recourse borrowings - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | $ 20,020 | $ 18,544
Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 20,177 |
Deferred financing costs and other |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | (157) |
2021 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 1,052 |
2022 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 881 |
2023 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 2,767 |
2024 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 2,015 |
2025 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 3,554 |
Thereafter | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 9,908 |
Utilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 8,067 | 7,213
Utilities | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 8,100 |
Utilities | Deferred financing costs and other |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | (33) |
Utilities | 2021 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 486 |
Utilities | 2022 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 351 |
Utilities | 2023 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 1,676 |
Utilities | 2024 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 1,370 |
Utilities | 2025 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 783 |
Utilities | Thereafter | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 3,434 |
Transport |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 6,635 | 8,210
Transport | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 6,680 |
Transport | Deferred financing costs and other |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | (45) |
Transport | 2021 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 431 |
Transport | 2022 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 454 |
Transport | 2023 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 330 |
Transport | 2024 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 391 |
Transport | 2025 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 928 |
Transport | Thereafter | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 4,146 |
Midstream |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 2,111 | 2,198
Midstream | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 2,153 |
Midstream | Deferred financing costs and other |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | (42) |
Midstream | 2021 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 10 |
Midstream | 2022 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 11 |
Midstream | 2023 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 510 |
Midstream | 2024 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 10 |
Midstream | 2025 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 1,088 |
Midstream | Thereafter | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 524 |
Data |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 3,207 | $ 923
Data | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 3,244 |
Data | Deferred financing costs and other |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | (37) |
Data | 2021 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 125 |
Data | 2022 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 65 |
Data | 2023 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 251 |
Data | 2024 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 244 |
Data | 2025 | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | 755 |
Data | Thereafter | Gross |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-recourse borrowings | $ 1,804 |

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