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DEBT AND CREDIT FACILITIES - Long Term Debt Summary (Details) $ in Millions, $ in Millions | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Mar. 04, 2021 USD ($) | Mar. 04, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($)
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DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Interest rate | 5.00% | 5.00% |  |  | 4.80% | 4.80%
Lease liabilities |  | $ 2,850.0 |  |  |  | $ 2,908.0
Deferred financing costs |  | (58.0) |  |  |  | (54.0)
Total gross debt and lease liabilities |  | 17,070.0 |  |  |  | 18,133.0
Current portion of longterm debt and lease liabilities |  |  |  |  |  |
Current portion of lease liabilities |  | (310.0) |  |  |  | (272.0)
Current portion of long-term debt |  | (231.0) |  |  |  | (1,413.0)
Current portion of long-term debt and lease liabilities |  | (541.0) |  |  |  | (1,685.0)
Long-term lease liabilities |  | 2,540.0 |  |  |  | 2,636.0
Long-term debt |  | $ 13,989.0 |  |  |  | 13,812.0
Minimum |  |  |  |  |  |
Additional information |  |  |  |  |  |
Interest rate on lease liabilities | 0.40% | 0.40% |  |  |  |
Maximum |  |  |  |  |  |
Additional information |  |  |  |  |  |
Interest rate on lease liabilities | 14.20% | 14.20% |  |  |  |
Unsecured long-term debt |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Total unsecured long term debt |  | $ 14,278.0 |  |  |  | $ 15,279.0
3.10% Series 5 Medium Term Notes, due 2021 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt |  | $ 750.0 |  |  |  |
Interest rate | 3.10% | 3.10% |  |  | 3.10% | 3.10%
Total unsecured long term debt |  |  |  |  |  | $ 748.0
9.25% Debentures, due 2021 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 300 | $ 371.0 |  |  | $ 300 |
Interest rate | 9.25% | 9.25% |  |  | 9.25% | 9.25%
Total unsecured long term debt |  |  |  |  |  | $ 389.0
9.40% Notes, due 2021 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 220 | $ 278.0 |  |  | $ 220 |
Interest rate | 9.40% | 9.40% |  |  | 9.40% | 9.40%
Total unsecured long term debt |  |  |  |  |  | $ 281.0
Additional information |  |  |  |  |  |
Revised debt coupon rate following ratings downgrade by Moodys | 9.40% | 9.40% |  |  | 7.90% | 7.90%
4.50% Notes, due 2022 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 182 |  |  |  |  |
Interest rate | 4.50% | 4.50% |  |  | 4.50% | 4.50%
Total unsecured long term debt |  | $ 231.0 |  |  |  | $ 224.0
2.80% Notes, due 2023 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 450 |  |  |  | $ 450 |
Interest rate | 2.80% | 2.80% |  |  | 2.80% | 2.80%
Total unsecured long term debt |  | $ 569.0 |  |  |  | $ 574.0
3.60% Notes, due 2024 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 750 | $ 951.0 |  |  | $ 750 |
Interest rate | 3.60% | 3.60% |  |  | 3.60% | 3.60%
Total unsecured long term debt |  |  |  |  |  | $ 953.0
3.10% Notes, due 2025 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 550 |  |  |  | $ 550 |
Interest rate | 3.10% | 3.10% |  |  | 3.10% | 3.10%
Total unsecured long term debt |  | $ 696.0 |  |  |  | $ 701.0
3.00% Series 5 Medium Term Notes, due 2026 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Interest rate | 3.00% | 3.00% |  |  | 3.00% | 3.00%
Total unsecured long term debt |  | $ 699.0 |  |  |  | $ 699.0
7.875% Debentures, due 2026 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 275 |  |  |  |  |
Interest rate | 7.875% | 7.875% |  |  | 7.875% | 7.875%
Total unsecured long term debt |  | $ 359.0 |  |  |  | $ 364.0
8.20% Notes, due 2027 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 59 |  |  |  |  |
Interest rate | 8.20% | 8.20% |  |  | 8.20% | 8.20%
Total unsecured long term debt |  | $ 78.0 |  |  |  | $ 79.0
7.00% Debentures, due 2028 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 250 |  |  |  |  |
Interest rate | 7.00% | 7.00% |  |  | 7.00% | 7.00%
Total unsecured long term debt |  | $ 320.0 |  |  |  | $ 323.0
3.10% Series 6 Medium Term Notes, due 2029 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Interest rate | 3.10% | 3.10% |  |  | 3.10% | 3.10%
Total unsecured long term debt |  | $ 748.0 |  |  |  | $ 748.0
5.00% Series 7 Medium Term Notes, Due 2030 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 1,250.0
Interest rate | 5.00% | 5.00% |  |  | 5.00% | 5.00%
Total unsecured long term debt |  | $ 1,247.0 |  |  |  | $ 1,247.0
7.15% Notes, due 2032 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 500 |  |  |  |  |
Interest rate | 7.15% | 7.15% |  |  | 7.15% | 7.15%
Total unsecured long term debt |  | $ 631.0 |  |  |  | $ 637.0
5.35% Notes, due 2033 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 300 |  |  |  |  |
Interest rate | 5.35% | 5.35% |  |  | 5.35% | 5.35%
Total unsecured long term debt |  | $ 355.0 |  |  |  | $ 356.0
5.95% Notes, due 2034 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 500 |  |  |  |  |
Interest rate | 5.95% | 5.95% |  |  | 5.95% | 5.95%
Total unsecured long term debt |  | $ 630.0 |  |  |  | $ 636.0
5.95% Notes, due 2035 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 600 |  |  |  |  |
Interest rate | 5.95% | 5.95% |  |  | 5.95% | 5.95%
Total unsecured long term debt |  | $ 731.0 |  |  |  | $ 736.0
5.39% Series 4 Medium Term Notes, due 2037 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Interest rate | 5.39% | 5.39% |  |  | 5.39% | 5.39%
Total unsecured long term debt |  | $ 599.0 |  |  |  | $ 599.0
6.50% Notes, due 2038 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 1,150 |  |  |  |  |
Interest rate | 6.50% | 6.50% |  |  | 6.50% | 6.50%
Total unsecured long term debt |  | $ 1,451.0 |  |  |  | $ 1,464.0
6.80% Notes, due 2038 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 900 |  |  |  |  |
Interest rate | 6.80% | 6.80% |  |  | 6.80% | 6.80%
Total unsecured long term debt |  | $ 1,156.0 |  |  |  | $ 1,167.0
6.85% Notes, due 2039 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 750 |  |  |  |  |
Interest rate | 6.85% | 6.85% |  |  | 6.85% | 6.85%
Total unsecured long term debt |  | $ 946.0 |  |  |  | $ 953.0
6.00% Notes, due 2042 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 152 |  |  |  |  |
Interest rate | 6.00% | 6.00% |  |  | 6.00% | 6.00%
Total unsecured long term debt |  | $ 149.0 |  |  |  | $ 149.0
4.34% Series 5 Medium Term Notes, due 2046 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Interest rate | 4.34% | 4.34% |  |  | 4.34% | 4.34%
Total unsecured long term debt |  | $ 300.0 |  |  |  | $ 300.0
4.00% Notes, due 2047 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 750 |  |  |  |  |
Interest rate | 4.00% | 4.00% |  |  |  |
Total unsecured long term debt |  | $ 945.0 |  |  |  | $ 952.0
3.95% Series 8 Medium Term Notes, due 2051 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt |  |  |  | $ 500.0 |  |
Interest rate | 3.95% | 3.95% | 3.95% | 3.95% |  |
Total unsecured long term debt |  | $ 493.0 |  |  |  |
3.75% Notes, due 2051 |  |  |  |  |  |
DEBT AND CREDIT FACILITIES |  |  |  |  |  |
Face amount of debt | $ 750 |  | $ 750 |  |  |
Interest rate | 3.75% | 3.75% | 3.75% | 3.75% |  |
Total unsecured long term debt |  | $ 945.0 |  |  |  |

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