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DEBT AND CREDIT FACILITIES - Long Term Debt Narrative (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Mar. 05, 2021 CAD ($) | Mar. 04, 2021 USD ($) $ / shares | Mar. 04, 2021 CAD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2020 CAD ($) $ / shares
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.00% |  | 5.00% |  |  | 5.00% |  |  |  | 4.80% | 4.80%
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 6,951 |  |  |  |  |
4.50% Notes, due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 182 |  | $ 182 |  |  |  |  |  |  |  |
Interest rate |  |  | 4.50% |  | 4.50% |  |  | 4.50% |  |  |  | 4.50% | 4.50%
9.25% Debentures, due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 300 |  | $ 300 |  |  | $ 371 |  |  |  | $ 300 |
Interest rate |  |  | 9.25% |  | 9.25% |  |  | 9.25% |  |  |  | 9.25% | 9.25%
Payments for early redemption of senior unsecured notes |  |  | $ 314 | $ 388 |  |  |  |  |  |  |  |  |
Accrued interest |  |  | 14 |  | $ 14 |  |  | $ 17 |  |  |  |  |
3.60% Notes, due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 750 |  | $ 750 |  |  | $ 951 |  |  |  | $ 750 |
Interest rate |  |  | 3.60% |  | 3.60% |  |  | 3.60% |  |  |  | 3.60% | 3.60%
Payments for early redemption of senior unsecured notes |  |  |  |  | $ 822 | $ 1,000 |  |  |  |  |  |  |
Accrued interest |  |  | $ 9 |  | 9 |  |  | $ 11 |  |  |  |  |
Loss on extinguishment of long-term debt |  |  |  |  |  | 80 |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  | 60 |  |  |  |  |  |  |
3.75% Notes, due 2051 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 750 |  | $ 750 |  |  |  |  | $ 750 |  |  |
Interest rate |  |  | 3.75% |  | 3.75% |  |  | 3.75% |  | 3.75% | 3.75% |  |
Issuance price per $100 principal amount | $ / shares |  |  |  |  |  |  |  |  |  | $ 99.518 |  |  |
Effective yield |  |  |  |  |  |  |  |  |  | 3.777% | 3.777% |  |
3.95% Series 8 Medium Term Notes, due 2051 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  | $ 500 |  |
Interest rate |  |  | 3.95% |  | 3.95% |  |  | 3.95% |  | 3.95% | 3.95% |  |
Issuance price per $100 principal amount | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 98.546 |  |
Effective yield |  |  |  |  |  |  |  |  |  | 4.034% | 4.034% |  |
3.10% Series 5 Medium Term Notes, due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 750 |  |  |  |  |
Interest rate |  |  | 3.10% |  | 3.10% |  |  | 3.10% |  |  |  | 3.10% | 3.10%
Payments for early redemption of senior unsecured notes |  |  |  |  |  | 770 |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  | $ 8 |  |  |  |  |
Loss on extinguishment of long-term debt |  |  |  |  |  | 12 |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  | 9 |  |  |  |  |  |  |
9.40% Notes, due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 220 |  | $ 220 |  |  | $ 278 |  |  |  | $ 220 |
Interest rate |  |  | 9.40% |  | 9.40% |  |  | 9.40% |  |  |  | 9.40% | 9.40%
Payments for early redemption of senior unsecured notes |  |  |  |  | $ 230 | 290 |  |  |  |  |  |  |
Accrued interest |  |  | $ 2 |  | $ 2 |  |  | $ 2 |  |  |  |  |
Loss on extinguishment of long-term debt |  |  |  |  |  | 10 |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  | $ 8 |  |  |  |  |  |  |
5.00% Series 7 Medium Term Notes, Due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250
Interest rate |  |  | 5.00% |  | 5.00% |  |  | 5.00% |  |  |  | 5.00% | 5.00%
Issuance price per $100 principal amount | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 99.697
Effective yield |  |  |  |  |  |  |  |  |  |  |  | 5.039% | 5.039%
2.80% Notes, due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 450 |  | $ 450 |  |  |  |  |  |  | $ 450 |
Interest rate |  |  | 2.80% |  | 2.80% |  |  | 2.80% |  |  |  | 2.80% | 2.80%
Issuance price per $100 principal amount | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 99.903 |
Effective yield |  |  |  |  |  |  |  |  |  |  |  | 2.834% | 2.834%
3.10% Notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 550 |  | $ 550 |  |  |  |  |  |  | $ 550 |
Interest rate |  |  | 3.10% |  | 3.10% |  |  | 3.10% |  |  |  | 3.10% | 3.10%
Issuance price per $100 principal amount | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 99.949 |
Effective yield |  |  |  |  |  |  |  |  |  |  |  | 3.111% | 3.111%
Syndicated Credit Facilities, Tranche 1 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in available borrowing capacity |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 2,000 |  | 2,000 |  |  |  |  |  |  |  |
Syndicated Credit Facilities, Tranche 2 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in available borrowing capacity |  |  |  |  | 500 |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 3,000 |  | $ 3,000 |  |  |  |  |  |  |  |
Bilateral credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facilities terminated |  |  |  |  |  |  |  |  | $ 2,800 |  |  |  |
Term of debt | 2 years | 2 years |  |  |  |  |  |  |  |  |  |  |
Early redemption of notes | 4.50% Notes, due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 182 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.50% |  |  |  |  |  |

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