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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) $ in Millions | Oct. 10, 2017 USD ($) | Oct. 10, 2017 CAD ($) | Oct. 30, 2015 CAD ($) | Dec. 31, 2017 | Apr. 17, 2017 CAD ($) | Feb. 22, 2017 CAD ($) | Mar. 11, 2015 CAD ($)
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Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.30% |  |  |
Medium-term notes, maturing February 22, 2024 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.30% | 3.30% |  |
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 3.10% | 3.30% |
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 4.00% | 4.10% |
Medium Term Notes, Public - Canadian - Maturing October 30, 2018 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.00% |  |  |
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.50% |  |  |
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.50% |  |  |
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.50% |  |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 400,000,000 |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | CAD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 3.30% |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | USD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 4.00% |  |
Debt Issuers | Medium-term notes, maturing February 22, 2024 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 300,000,000 |
Debt Issuers | Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 3.30% |
Debt Issuers | Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 4.10% |
Debt Issuers | Medium-term Notes Under The Indenture In The Canadian Bond Market |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Face amount |  |  | $ 500,000,000 |  |  |  |
Debt Issuers | Medium-term Notes Under The Indenture In The Canadian Bond Market | Fixed interest rate | USD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.80% |  |  |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2018 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Face amount |  |  | $ 125,000,000 |  |  |  |
Period term |  |  | 3 years |  |  |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2018 | Fixed interest rate | CAD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.00% |  |  |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2020 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Face amount |  |  | $ 375,000,000 |  |  |  |
Period term |  |  | 5 years |  |  |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate | CAD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.50% |  |  |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing March 11, 2022 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 450,000,000
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate | CAD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 3.50%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate | USD |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 3.90%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 10, 2017 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Amount repaid | $ 306 | $ 400,000,000 |  |  |  |  |

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