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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity and Credit Risk (Details) - CAD ($) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
LIQUIDITY RISK AND CREDIT RISK |  |
Rolling time period over which the Company forecasts cash requirements | 12 months |
Period of anticipated requirements for which the Company maintains sufficient liquidity through committed credit facilities | 1 year |
Period after which receivables are classified as past due | 30 days |
Derivative instruments |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | $ 317,000,000 | $ 562,000,000
Cash collateral on asset exposure | 0 | 0
Derivative instruments | Canadian financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 44,000,000 | 28,000,000
Derivative instruments | United States financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 31,000,000 | 107,000,000
Derivative instruments | European financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 80,000,000 | 84,000,000
Derivative instruments | Asian financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 11,000,000 | 6,000,000
Derivative instruments | Other |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | $ 151,000,000 | $ 337,000,000

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