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LONG-TERM DEBT - Summary of Long-term Debt (Details) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Mar. 11, 2022 CAD ($) | Mar. 11, 2022 USD ($) | Feb. 11, 2022 USD ($) | Dec. 31, 2021 CAD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | $ 29,905,000,000 |  |  |  |  | $ 17,137,000,000
Deferred transaction costs and discounts | (1,122,000,000) |  |  |  |  | (185,000,000)
Less current portion | (1,828,000,000) |  |  |  |  | (1,551,000,000)
Senior Notes Due 2022 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,450,000,000
Interest rate |  |  |  |  |  | 5.34%
Senior Notes Due 2022 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 600,000,000 |  |  |  |  |
Interest rate | 4.00% | 4.00% |  |  |  |
Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 750,000,000 | $ 750,000,000 |  | $ 1,000,000,000 | $ 750,000,000 |
Senior Notes Due 2023 - 3.000% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  |
Interest rate | 3.00% | 3.00% |  |  |  |
Senior Notes Due 2023 - 4.100% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 850,000,000 |  |  |  |
Interest rate | 4.10% | 4.10% |  |  |  |
Senior Notes Due 2024 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 600,000,000 |  |  |  |  |
Interest rate | 4.00% | 4.00% |  |  |  |
Senior Notes Due 2025 - 2.950% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |
Interest rate | 2.95% | 2.95% | 2.95% | 2.95% |  |
Senior Notes Due 2025 - 3.100% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 1,250,000,000 |  | $ 1,250,000,000 |  |  |
Interest rate | 3.10% | 3.10% | 3.10% | 3.10% |  |
Senior Notes Due 2025 3.625% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 700,000,000 |  |  |  |
Interest rate | 3.625% | 3.625% |  |  |  |
Senior Notes Due 2026 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  |
Interest rate | 2.90% | 2.90% |  |  |  |
Senior Notes Due 2027 - 3.650% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 1,500,000,000 |  |  |  |  |
Interest rate | 3.65% | 3.65% |  |  |  |
Senior Notes Due 2027 - 3.200% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 1,300,000,000 |  | $ 1,300,000,000 |  |
Interest rate | 3.20% | 3.20% | 3.20% | 3.20% |  |
Senior Notes Due 2029 - 3.750% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |
Interest rate | 3.75% | 3.75% | 3.75% | 3.75% |  |
Senior Notes Due 2029 - 3.250% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 1,000,000,000 |  |  |  |  |
Interest rate | 3.25% | 3.25% |  |  |  |
Senior Notes Due 2032 - 3.800% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 2,000,000,000 |  | $ 2,000,000,000 |  |
Interest rate | 3.80% | 3.80% | 3.80% | 3.80% |  |
Senior Notes Due 2032 - 4.250% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |
Interest rate | 4.25% | 4.25% | 4.25% | 4.25% |  |
Senior Debentures Due 2032 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 200,000,000 |  |  |  |
Interest rate | 8.75% | 8.75% |  |  |  |
Senior Notes Due 2038 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 350,000,000 |  |  |  |
Interest rate | 7.50% | 7.50% |  |  |  |
Senior Notes Due 2039 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 500,000,000 |  |  |  |  |
Interest rate | 6.68% | 6.68% |  |  |  |
Senior Notes Due 2040 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 800,000,000 |  |  |  |  |
Interest rate | 6.11% | 6.11% |  |  |  |
Senior Notes Due 2041 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 400,000,000 |  |  |  |  |
Interest rate | 6.56% | 6.56% |  |  |  |
Senior Notes Due 2042 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  | $ 750,000,000 |  |
Interest rate | 4.50% | 4.50% | 4.50% | 4.50% |  |
Senior Notes Due 2043 - 4.500% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |  |
Interest rate | 4.50% | 4.50% |  |  |  |
Senior Notes Due 2043 - 5.450% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 650,000,000 |  |  |  |
Interest rate | 5.45% | 5.45% |  |  |  |
Senior Notes Due 2044 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 1,050,000,000 |  |  |  |
Interest rate | 5.00% | 5.00% |  |  |  |
Senior Notes Due 2048 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  |  |  |
Interest rate | 4.30% | 4.30% |  |  |  |
Senior Notes Due 2049 - 4.350% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 1,250,000,000 |  |  |  |
Interest rate | 4.35% | 4.35% |  |  |  |
Senior Notes Due 2049 - 3.700% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 1,000,000,000 |  |  |  |
Interest rate | 3.70% | 3.70% |  |  |  |
Senior Notes Due 2052 - 4.550% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 2,000,000,000 |  | $ 2,000,000,000 |  |
Interest rate | 4.55% | 4.55% | 4.55% | 4.55% |  |
Senior Notes Due 2052 - 5.250% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |
Interest rate | 5.25% | 5.25% | 5.25% | 5.25% |  |
Subordinated Notes Due 2081 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 2,000,000,000 |  |  |  |  |
Interest rate | 5.00% | 5.00% |  |  |  |
Subordinated Notes Due 2082 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  |  |  |
Interest rate | 5.25% | 5.25% |  |  |  |
Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | $ 32,855,000,000 |  |  |  |  | $ 18,873,000,000
Gross carrying amount | Senior Notes Due 2022 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 0 |  |  |  |  | 600,000,000
Gross carrying amount | Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 0 |  |  |  |  | 951,000,000
Gross carrying amount | Senior Notes Due 2023 - 3.000% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 677,000,000 |  |  |  |  | 634,000,000
Gross carrying amount | Senior Notes Due 2023 - 4.100% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,151,000,000 |  |  |  |  | 1,078,000,000
Gross carrying amount | Senior Notes Due 2024 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 600,000,000 |  |  |  |  | 600,000,000
Gross carrying amount | Senior Notes Due 2025 - 2.950% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,354,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Notes Due 2025 - 3.100% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,250,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Notes Due 2025 3.625% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 948,000,000 |  |  |  |  | 886,000,000
Gross carrying amount | Senior Notes Due 2026 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 677,000,000 |  |  |  |  | 634,000,000
Gross carrying amount | Senior Notes Due 2027 - 3.650% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,500,000,000 |  |  |  |  | 1,500,000,000
Gross carrying amount | Senior Notes Due 2027 - 3.200% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,761,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Notes Due 2029 - 3.750% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,000,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Notes Due 2029 - 3.250% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,000,000,000 |  |  |  |  | 1,000,000,000
Gross carrying amount | Senior Notes Due 2032 - 3.800% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 2,709,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Notes Due 2032 - 4.250% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,000,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Debentures Due 2032 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 271,000,000 |  |  |  |  | 254,000,000
Gross carrying amount | Senior Notes Due 2038 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 474,000,000 |  |  |  |  | 444,000,000
Gross carrying amount | Senior Notes Due 2039 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 500,000,000 |  |  |  |  | 500,000,000
Gross carrying amount | Senior Notes Due 2040 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 800,000,000 |  |  |  |  | 800,000,000
Gross carrying amount | Senior Notes Due 2041 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 400,000,000 |  |  |  |  | 400,000,000
Gross carrying amount | Senior Notes Due 2042 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,016,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Notes Due 2043 - 4.500% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 677,000,000 |  |  |  |  | 634,000,000
Gross carrying amount | Senior Notes Due 2043 - 5.450% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 880,000,000 |  |  |  |  | 823,000,000
Gross carrying amount | Senior Notes Due 2044 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,422,000,000 |  |  |  |  | 1,331,000,000
Gross carrying amount | Senior Notes Due 2048 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,016,000,000 |  |  |  |  | 951,000,000
Gross carrying amount | Senior Notes Due 2049 - 4.350% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,693,000,000 |  |  |  |  | 1,585,000,000
Gross carrying amount | Senior Notes Due 2049 - 3.700% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,354,000,000 |  |  |  |  | 1,268,000,000
Gross carrying amount | Senior Notes Due 2052 - 4.550% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 2,709,000,000 |  |  |  |  | 0
Gross carrying amount | Senior Notes Due 2052 - 5.250% | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 1,000,000,000 |  |  |  |  | 0
Gross carrying amount | Subordinated Notes Due 2081 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | 2,000,000,000 |  |  |  |  | 2,000,000,000
Gross carrying amount | Subordinated Notes Due 2082 | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Long-term debt | $ 1,016,000,000 |  |  |  |  | $ 0

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