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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Apr. 17, 2017 | Feb. 22, 2017
--- | --- | --- | --- | ---
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 |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.18% |  |  |
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 October 30, 2018 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 95 | 99 |  |
Medium Term Notes, Public - Canadian - Maturing October 30, 2018 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 3.00% |  |  |
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 285 | 298 |  |
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 3.50% |  |  |
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 343 | 358 |  |
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 3.50% |  |  |
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 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 3.30% |  | 3.30% |
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] |  |  |  |
Annual 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 |  |
Revolving credit facility with Brookfield | Floating interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, adjustment to interest rate basis | 2.00% |  |  |
Corporate borrowings |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 1,256 | $ 2,101 |  |

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- Definition Line of Credit Facility, Maximum Borrowing Capacity + References No definition available. + Details
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- Definition Line of Credit Facility, Unused Capacity, Commitment Fee Percentage + References No definition available. + Details
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