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LEGAL PROCEEDINGS - Securities Class Actions and Related Matters (Details) $ in Millions, $ in Millions |  |  | 9 Months Ended | 12 Months Ended | 23 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2020 CAD ($) | Dec. 07, 2017 insurance_policy_period | Sep. 30, 2023 action group case | Dec. 31, 2015 case | Jun. 30, 2023 USD ($) | May 22, 2023 defendant | Jul. 20, 2021 insured | Mar. 17, 2021 number_business | Feb. 15, 2019 entity
US Securities Litigation, Opt-Out Action | New Jersey |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of groups of investors filing action | group |  |  | 37 |  |  |  |  |  |
Number of claims dismissed | case |  |  | 16 |  |  |  |  |  |
Number of groups of investors filing action, remain pending | group |  |  | 21 |  |  |  |  |  |
Number of defendants fully dismissed | defendant |  |  |  |  |  | 0 |  |  |
Canadian Securities Litigation | Canada |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of suits filed | case |  |  |  | 6 |  |  |  |  |
Canadian Securities Litigation | Canada | Violation of Canadian Provincial Securities Legislation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of suits filed but not yet served | action |  |  | 2 |  |  |  |  |  |
Number of entities, exercised opt-out right, pursuing action |  |  |  |  |  |  |  | 4 | 1
Canadian Securities Litigation | Settled Litigation | Canada | Violation of Canadian Provincial Securities Legislation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Settlement, agreed to pay | $ | $ 94 |  |  |  |  |  |  |  |
Insurance Coverage Lawsuit |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of distinct insurance policy periods | insurance_policy_period |  | 2 |  |  |  |  |  |  |
Insurance Coverage Lawsuit | Settled Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Settlement agreements, number of insurers | insured |  |  |  |  |  |  | 2 |  |
Aggregate amount to be received | $ |  |  |  |  | $ 313 |  |  |  |

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