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DEBT AND CREDIT FACILITIES - Credit Facilities- (Details) - CAD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |  |
Total credit facilities |  | $ 11,074 |
Total unutilized credit facilities |  | 6,350 |
Available credit facilities for liquidity purposes |  | 6,043 | $ 4,701
Credit facilities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Increase additional borrowing capacity | $ 2,800 |  |
Fully revolving and expires in 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total credit facilities |  | 3,500 |
Fully revolving and expires in 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total credit facilities |  | 7,064 |
Fully revolving and expires in 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total credit facilities |  | 380 |
Can be terminated at any time at the option of the lenders |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total credit facilities |  | 130 |
Credit facilities supporting outstanding commercial paper |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Credit facilities assigned |  | (3,566) |
Credit facilities supporting standby letters of credit |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Credit facilities assigned |  | $ (1,158) |

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- Definition The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_50_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Represents the portion of line of credit facilities that are assigned for specific purposes. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The increase above the maximum borrowing capacity under the credit facility. + References No definition available. + Details
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Balance Type: | credit
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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |