LEASES - Narrative (Details) - USD ($) $ in Millions		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Finance lease		$ 0
Sub-lease income		0
Right-of-use assets obtained in exchange for new operating lease liabilities, excluding amount recognized upon adoption of new accounting standard		$ 28
Right-of-use assets obtained in exchange for new operating lease liabilities, upon adoption of new accounting standard	$ 282
Minimum
Lessee, Lease, Description [Line Items]
Lease term		1 year
Lease renewal term		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term		20 years
Lease renewal term		5 years