VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entities
Assets	[1]	$ 13,382	$ 17,370
Consolidated VIEs
Variable Interest Entities
Assets		233	228
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Assets		75	71
Loss on investments		38	50	$ 45
Eliminations
Variable Interest Entities
Assets		(6,387)	(7,696)
Eliminations | Consolidated VIEs
Variable Interest Entities
Liabilities associated with the certain outsourcing agreements and purchase options		$ 131	$ 127
Minimum | Consolidated VIEs
Variable Interest Entities
Outsourcing agreement initial term		5 years

[1] Our consolidated total assets as of December 31, 2020 and 2019 include total assets of variable interest entities (VIEs) of $233 million and $228 million, respectively, which can only be used to settle the obligations of the VIEs.  Our consolidated total liabilities as of December 31, 2020 and 2019 include total liabilities of the VIEs of $60 million and $27 million, respectively, for which the creditors of the VIEs have no recourse to us.  See Note 14. Variable Interest Entities.