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LEGAL PROCEEDINGS - Securities and RICO Class Actions and Related Matters (Details) $ in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Jul. 20, 2021 USD ($) insured | Aug. 04, 2020 CAD ($) | Dec. 16, 2019 USD ($) | Dec. 07, 2017 insurance_policy_period | Oct. 31, 2015 case | Sep. 16, 2016 action | Sep. 30, 2021 USD ($) action group case | Dec. 31, 2015 case | Mar. 17, 2021 entity | Sep. 13, 2019 action | Sep. 10, 2019 action | Feb. 15, 2019 entity
US Securities Litigation | 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 |  |  |  |  |
US Securities Litigation | New Jersey | Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of suits filed | case |  |  |  |  | 4 |  |  |  |  |  |  |
US Securities Litigation | Settled Litigation | New Jersey |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement, agreed to pay | $ |  |  | $ 1,210 |  |  |  | $ 1,210 |  |  |  |  |
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 | entity |  |  |  |  |  |  |  |  | 4 |  |  | 1
Canadian Securities Litigation | Settled Litigation | Canada | Violation of Canadian Provincial Securities Legislation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement, agreed to pay | $ |  | $ 94 |  |  |  |  |  |  |  |  |  |
RICO Class Actions | New Jersey | Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of suits filed | action |  |  |  |  |  | 3 |  |  |  |  |  |
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 | $ | $ 213 |  |  |  |  |  |  |  |  |  |  |
Derivative Lawsuits |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of alleged stockholders, filed lawsuits | action |  |  |  |  |  |  |  |  |  | 2 | 2 |

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