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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - LIQUIDITY AND CREDIT RISK (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
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 |
Letters of credit provided in lieu of providing cash collateral to counterparties | $ 0 |
Cash collateral | $ 0 | $ 0
Period after which receivables are classified as past due | 30 days |
Interest Rate Swaption |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Average swap rate (as a percent) | 3.90% |
Interest rate contracts - long-term borrowings |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Average swap rate (as a percent) | 2.00% |
Maximum |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Policy limit increase (percent) | 30.00% |
Derivative instruments |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | $ 887,000,000 | 872,000,000
Derivative instruments | Canadian financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 424,000,000 | 481,000,000
Derivative instruments | United States financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 130,000,000 | 99,000,000
Derivative instruments | European financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 181,000,000 | 28,000,000
Derivative instruments | Asian financial institutions |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | 30,000,000 | 167,000,000
Derivative instruments | Other |  |
LIQUIDITY RISK AND CREDIT RISK |  |
Maximum credit exposure with respect to derivative instruments | $ 122,000,000 | $ 97,000,000

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