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LONG-TERM DEBT - Bank Credit and Letter of Credit Facilities (Details) $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | $ 16,751,000,000 |  | $ 15,967,000,000 |  |  |
Short-term borrowings | 1,221,000,000 |  | 2,238,000,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum borrowing capacity | $ 3,200,000,000 |  |  |  |  |
Revolving Credit Facility | Bank Prime Rate or Base Rate | Minimum |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Spread on variable rate | 0.00% | 0.00% |  |  |  |
Revolving Credit Facility | Bank Prime Rate or Base Rate | Maximum |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Spread on variable rate | 1.75% | 1.75% |  |  |  |
Revolving Credit Facility | Bankers' Acceptance Rate or London Inter-Bank Offered Rate | Minimum |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Spread on variable rate | 0.85% | 0.85% |  |  |  |
Revolving Credit Facility | Bankers' Acceptance Rate or London Inter-Bank Offered Rate | Maximum |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Spread on variable rate | 2.75% | 2.75% |  |  |  |
Bank and Letter of Credit Facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum borrowing capacity | $ 3,300,000,000 |  | 3,300,000,000 |  |  |
Available liquidity | 2,600,000,000 |  | 1,600,000,000 |  |  |
Long-term debt | 100,000,000 |  | 100,000,000 |  |  |
Commercial paper program |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Short-term borrowings | $ 571,000,000 | $ 449 | $ 1,600,000,000 | $ 1,223 | $ 1,605,000,000 | $ 1,177

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