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SHORT-TERM BORROWINGS - Proceeds/Repayments From Borrowing Programs (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received from short-term borrowings | $ 150,000,000 |  | $ 0 |
Net proceeds received from (repayment of) short-term borrowings | 971,000,000 |  | (1,146,000,000) |
Receivables securitization program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received from short-term borrowings | 150,000,000 |  | 0 |
US commercial paper program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received from short-term borrowings | $ 3,235,000,000 | $ 2,568 | $ 4,406,000,000 | $ 3,316
Exchange rate on proceeds received from short-term borrowings | 1.260 | 1.260 | 1.329 | 1.329
Repayments of short-term borrowings | $ (2,914,000,000) | $ (2,314) | $ (5,552,000,000) | $ (4,098)
Exchange rate on repayments of short-term borrowings | 1.259 | 1.259 | 1.355 | 1.355
Net proceeds received from (repayment of) short-term borrowings | $ 321,000,000 | $ 254 | $ (1,146,000,000) | $ (782)
Credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received from short-term borrowings | $ 1,503,000,000 | $ 1,200 | $ 0 | $ 0
Exchange rate on proceeds received from short-term borrowings | 1.253 | 1.253 | 0 | 0
Repayments of short-term borrowings | $ (1,003,000,000) | $ (800) | $ 0 | $ 0
Exchange rate on repayments of short-term borrowings | 1.254 | 1.254 | 0 | 0
Net proceeds received from (repayment of) short-term borrowings | $ 500,000,000 |  | $ 0 |

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