STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Apr. 01, 2019
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,600	$ 2,600
Stock Repurchase Program, Authorized Amount				$ 3,000
Payments for Repurchase of Common Stock	$ 101	$ 406	$ 0