LEGAL PROCEEDINGS - Securities and RICO Class Actions and Related Matters (Details) $ in Millions, $ in Millions						1 Months Ended	3 Months Ended	4 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Jul. 20, 2021 USD ($) insured	Aug. 04, 2020 CAD ($)	Dec. 16, 2019 USD ($)	Dec. 07, 2017 insurance_policy_period	Oct. 31, 2015 case	Mar. 31, 2022 USD ($) case group action	Sep. 16, 2016 action	Dec. 31, 2015 case	Mar. 17, 2021 entity	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
US Securities Litigation | Settled Litigation | New Jersey | Restricted Cash And Other Settlement Deposits, Current
Loss Contingencies [Line Items]
Settlement, agreed to pay	$ 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