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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) $ in Millions, $ in Millions | Feb. 22, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Nov. 29, 2024 CAD ($) | Jun. 05, 2024 CAD ($) | May 31, 2024 CAD ($) | Dec. 31, 2023 USD ($) | Jul. 27, 2023 CAD ($)
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Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  | $ 21,604 |  |  |  | $ 21,276 |
Subordinated notes, Maturing March 15, 2055 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  |  | $ 300 |  |  |  |
Annual rate |  | 6.80% |  |  |  |  |
Subordinated notes, Maturing May 31, 2084 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  |  |  | $ 8 | $ 150 |  |
Annual rate |  | 7.30% |  |  |  |  |
Medium-term Notes, Maturing July 27, 2030 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 700
Medium-term Notes, Maturing July 27, 2030 Tranche One |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | 500
Medium-term Notes, Maturing July 27, 2030 Tranche Two |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 200
Medium-term Notes, Maturing February 22, 2024 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Repayments of bonds, notes and debentures | $ 700 |  |  |  |  |  |
Fixed interest rate | Subordinated notes, Maturing March 15, 2055 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Annual rate |  | 6.80% | 6.80% |  |  |  |
Fixed interest rate | Subordinated notes, Maturing May 31, 2084 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Annual rate |  | 7.30% |  | 7.30% | 7.25% |  |
Fixed interest rate | Medium-term Notes, Maturing July 27, 2030 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Annual rate |  | 5.70% |  |  |  |  |
Fixed interest rate | Medium-term Notes, Maturing July 27, 2030 Tranche One |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Annual rate |  |  |  |  |  |  | 5.71%
Fixed interest rate | Medium-term Notes, Maturing July 27, 2030 Tranche Two |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Annual rate |  |  |  |  |  |  | 5.95%
Fixed interest rate | Medium-term Notes, Maturing February 22, 2024 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Annual rate | 3.315% | 3.30% |  |  |  |  |
Floating interest rate | Subordinated notes, Maturing March 15, 2030 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, variable rate |  |  | 2.453% |  |  |  |

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