LEGAL PROCEEDINGS - Securities and RICO Class Actions and Related Matters (Details) $ in Millions, $ in Millions					1 Months Ended	4 Months Ended	6 Months Ended	12 Months Ended
	Jul. 20, 2021 USD ($) insured	Aug. 04, 2020 CAD ($)	Dec. 16, 2019 USD ($)	Dec. 07, 2017 insurance_policy_period	Oct. 31, 2015 case	Sep. 16, 2016 action	Jun. 30, 2021 USD ($) case group action	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 | Subsequent Event
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