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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - OTHER FINANCIAL INSTRUMENTS (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value of Other Financial Instruments |  |
Equity investments at carrying value | $ 102,000,000 | $ 99,000,000
Restricted long-term investments (Note 14) | 323,000,000 | 267,000,000
Long-term debt | 64,400,000,000 | 67,400,000,000
Notes receivable, noncurrent | 97,000,000 | 89,000,000
Notes receivable, fair value | 97,000,000 | 89,000,000
Net Investment Hedges |  |
Fair Value of Other Financial Instruments |  |
Unrealized foreign exchange gain (loss) on translation of United States dollar denominated debt | 479,000,000 | 367,000,000
Unrealized gain (loss) on change in fair value of outstanding forward exchange forward contracts | 30,000,000 | 286,000,000
Realized loss associated with the settlement of foreign exchange forward contracts | 45,000,000 | 198,000,000
Realized gain (loss) associated with the settlement of United Stated dollar denominated debt that matured | 14,000,000 | 23,000,000
Amount of ineffectiveness | 0 | 0
Carrying value |  |
Fair Value of Other Financial Instruments |  |
Long-term debt | 63,900,000,000 | 64,000,000,000
Preference shares |  |
Fair Value of Other Financial Instruments |  |
Held-to-maturity securities | $ 478,000,000 | 371,000,000
Cumulative dividends based on average yield of Government of Canada bonds, maturity period of bonds | 10 years |
Held to maturity preferred share investment | $ 580,000,000 | $ 580,000,000
Noverco | Preference shares |  |
Fair Value of Other Financial Instruments |  |
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent) | 4.38% |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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