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BORROWINGS - Additional Information (Details) $ in Millions, $ in Millions |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 15, 2018 USD ($) | Jun. 30, 2018 USD ($) extension | Dec. 31, 2017 USD ($) | Apr. 17, 2017 CAD ($) | Feb. 22, 2017 CAD ($)
Corporate revolving credit facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 1,975 |  |  |
Subsidiary and corporate borrowings |  | 0 | $ 789 |  |
Letter of credit outstanding amount |  | $ 59 | 106 |  |
Corporate revolving credit facility | Floating interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, adjustment to interest rate basis |  | 1.20% |  |  |
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 228 | 239 |  |
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | CAD |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount |  |  |  | $ 400 | $ 300
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, interest rate |  | 3.30% |  | 3.30% |
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | CAD |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.10% |
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | USD |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, interest rate |  |  |  | 4.00% | 4.10%
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 305 | 318 |  |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, interest rate |  | 3.30% |  |  | 3.30%
Revolving credit facility with Brookfield |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 500 |  |  |
Subsidiary and corporate borrowings |  | $ 0 | 0 |  |
Borrowings, number of extensions | extension |  | 4 |  |  |
Revolving credit facility with Brookfield | Floating interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, adjustment to interest rate basis |  | 2.00% |  |  |
Commitment fees |  | $ 0 |  |  |
Corporate borrowings |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Subsidiary and corporate borrowings |  | 1,256 | 2,101 |  |
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities |  | (56) |  |  |
Non-recourse borrowings |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Subsidiary and corporate borrowings |  | 9,689 | $ 8,063 |  |
Increase in borrowings |  | 1,600 |  |  |
Increase (decrease) through financing cash flows, liabilities arising from financing activities |  | $ 100 |  |  |
Brazilian Regulated Gas Transmission Operation [Member] | Senior secured notes [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Subsidiary and corporate borrowings | $ 1,500 |  |  |  |
Debt Instrument, Period Term | 5 years |  |  |  |
Brazilian Regulated Gas Transmission Operation [Member] | Senior secured notes [Member] | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, interest rate | 7.10% |  |  |  |

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