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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Market Risk (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 08, 2023 USD ($) | Mar. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) stock-based_compensation_form | Dec. 31, 2023 CAD ($)
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |
Principal amount |  |  | $ 8,500,000,000 | $ 3,900,000,000
Three-Year Fixed Rate Notes | Notes Payable, Other Payables |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |
Principal amount | $ 700,000,000 |  |  |
Term of credit facility | 3 years |  |  |
Foreign exchange contracts |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |
Derivative instruments not designated as hedging instruments, loss |  | $ 638,000,000 |  |
Interest rate contracts - short-term borrowings |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |
Policy limit increase (as a percent) |  |  | 30.00% | 30.00%
Derivative, average fixed interest rate |  |  | 4.10% | 4.10%
Derivative, fixed interest rate | 6.00% |  |  |
Floating-To-Fixed Interest Rate Swaps |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |
Derivative, average fixed interest rate |  |  | 3.50% | 3.50%
Equity contracts |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |
Number of types of equity | stock-based_compensation_form |  |  | 1 |

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