RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - LIQUIDITY AND CREDIT RISK (Details) - CAD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
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)	3.00%
Interest rate contracts - long-term borrowings
LIQUIDITY RISK AND CREDIT RISK
Average swap rate (as a percent)	2.30%
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	$ 872,000,000	394,000,000
Derivative instruments \| Canadian financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	481,000,000	146,000,000
Derivative instruments \| United States financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	99,000,000	40,000,000
Derivative instruments \| European financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	28,000,000	3,000,000
Derivative instruments \| Asian financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	167,000,000	92,000,000
Derivative instruments \| Other
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	$ 97,000,000	$ 113,000,000

Represents the floating rate debt as a target percentage of the total debt outstanding.

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Represents the period after which receivables are classified as past due.

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No definition available.

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Represents the period of the entity's anticipated requirements which the entity can fund through committed credit facilities without having to access the capital markets.

+ References

No definition available.

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Represents the rolling time period over which the entity forecasts cash requirements to determine whether sufficient funds will be available.

+ References

No definition available.

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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Fair value of securities received as collateral against derivative assets.

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-Name Accounting Standards Codification
-Topic 210
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Average variable interest rate related to the group of interest rate derivatives.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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