RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity and Credit Risk (Details) - CAD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
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
Cash collateral	$ 0	$ 0
Policy limit increase (percent)	30.00%
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)	4.00%
Interest rate contracts - long-term borrowings
LIQUIDITY RISK AND CREDIT RISK
Average swap rate (as a percent)	2.20%
Derivative Instruments
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	$ 1,584,000,000	887,000,000
Derivative Instruments \| Canadian financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	644,000,000	424,000,000
Derivative Instruments \| US financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	277,000,000	130,000,000
Derivative Instruments \| European financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	334,000,000	181,000,000
Derivative Instruments \| Asian financial institutions
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	224,000,000	30,000,000
Derivative Instruments \| Other
LIQUIDITY RISK AND CREDIT RISK
Maximum credit exposure with respect to derivative instruments	$ 105,000,000	$ 122,000,000

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

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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.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Fair value of securities received as collateral against derivative assets.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313

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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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