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BORROWINGS - Corporate Borrowings (Details) - USD ($) | Mar. 13, 2018 | Dec. 31, 2017 | Apr. 17, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings |  | $ 10,164,000,000 |  | $ 8,326,000,000
Corporate revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings |  | $ 789,000,000 |  | 0
Unused commitment fee |  | 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 10, 2017 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings |  | $ 0 |  | 295,000,000
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate |  | 3.50% |  |
Medium Term Notes, Public - Canadian - Maturing October 30, 2018 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings |  | $ 99,000,000 |  | 93,000,000
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 |  | $ 298,000,000 |  | 279,000,000
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 |  | $ 358,000,000 |  | 335,000,000
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 |  | $ 239,000,000 |  | 0
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 |  | $ 318,000,000 |  | 0
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate |  | 3.30% |  |
Revolving credit facility with Brookfield |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
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% |  |
Subsequent Event | Revolving credit facility with Brookfield |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 400,000,000 |  |  |

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