GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 83	$ 82
Accumulated Amortization	17	14
Net	$ 66	68
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	7 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 21	21
Accumulated Amortization	5	4
Net	16	17
Acquired relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross	38	37
Accumulated Amortization	6	5
Net	$ 32	32
Naming rights
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	10 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 11	11
Accumulated Amortization	1	1
Net	10	10
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross	13	13
Accumulated Amortization	5	4
Net	$ 8	$ 9
Minimum | Acquired relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	5 years
Minimum | Other
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	2 years
Maximum | Acquired relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	15 years
Maximum | Other
Finite-Lived Intangible Assets [Line Items]
Amortizable Lives	7 years