VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Variable Interest Entity [Line Items]
Assets	[1]	$ 6,662		$ 12,541
Eliminations
Variable Interest Entity [Line Items]
Assets		$ (8,332)		(6,729)
Consolidated VIEs
Variable Interest Entity [Line Items]
Variable interest entities outsourcing agreement initial term		5 years
Assets		$ 118		217
Consolidated VIEs | Eliminations
Variable Interest Entity [Line Items]
Liabilities associated with the certain outsourcing agreements and purchase options		128		127
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		171		$ 175
Loss from equity method investments		$ (20)	$ 4

[1] Our consolidated total assets as of March 31, 2022 and December 31, 2021 include total assets of variable interest entities (VIEs) of $118 million and $217 million, respectively, which can only be used to settle the obligations of the VIEs. Our consolidated total liabilities as of March 31, 2022 and December 31, 2021 include total liabilities of VIEs of $17 million and $62 million, respectively, for which the creditors of the VIEs have no recourse to us. See Note 9. Variable Interest Entities.