VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entities
Total assets	[1]	$ 12,541	$ 13,382
Consolidated VIEs
Variable Interest Entities
Outsourcing agreement initial term		5 years
Total assets		$ 217	233
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Total assets		175	75
Loss on investments		(37)	38	$ 50
Eliminations
Variable Interest Entities
Total assets		(6,729)	(6,387)
Eliminations | Consolidated VIEs
Variable Interest Entities
Liabilities associated with the certain outsourcing agreements and purchase options		$ 127	$ 131

[1] Our consolidated total assets as of December 31, 2021 and 2020 include total assets of variable interest entities (VIEs) of $217 million and $233 million, respectively, which can only be used to settle the obligations of the VIEs. Our consolidated total liabilities as of December 31, 2021 and 2020 include total liabilities of the VIEs of $62 million and $60 million, respectively, for which the creditors of the VIEs have no recourse to us. See Note 14. Variable Interest Entities.