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SHORT-TERM BORROWINGS - Accounts Receivable Securitization (Details) - CAD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jan. 25, 2021 | Dec. 23, 2020 | Dec. 22, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Short-term borrowings from buyer | $ (1,221,000,000) |  |  |  | $ (2,238,000,000)
Receivables securitization program |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum proceeds under program |  |  | $ 1,200,000,000 | $ 1,050,000,000.00 |
Funding available under program |  |  | $ 650,000,000 |  |
Trade receivables, maximum commitment | $ 1,200,000,000 |  |  |  | 1,050,000,000
Term of program | 3 years |  |  |  |
Receivables sold to buyer as security | $ 2,130,000,000 |  |  |  | 1,359,000,000
Short-term borrowings from buyer | (650,000,000) |  |  |  | (650,000,000)
Overcollateralization | $ 1,480,000,000 |  |  |  | $ 709,000,000
Receivables securitization program | Minimum | Subsequent Event |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Funding available under program |  | $ 800,000,000 |  |  |

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