INCOME TAXES (Net deferred tax Assets/(Liabilities)) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets/(liabilities):
Net operating loss carryforward — U.S.		$ 37	$ 59
Net operating loss carryforward — International		15	20
Accrued expenses		35	50
Stock-based compensation and other stock based payments		49	51
Foreign currency translation adjustment		36	27
Tax credits		14	46
Euro-denominated debt		0	5
Operating lease liabilities		38	0
Property and equipment		31	6
Subtotal - deferred tax assets		255	264
Deferred Tax Liabilities, Discount on Convertible Debt		(10)	(22)
Intangible assets and other		(133)	(482)
Euro-denominated debt		(14)	0
State income tax on accumulated unremitted international earnings		(8)	(25)
Unrealized gains on investments		(191)	(2)
Operating lease assets		(35)	0
Installment sale liability		(284)	0
Other		(11)	(15)
Subtotal - deferred tax liabilities		(686)	(546)
Valuation allowance on deferred tax assets		(45)	(36)
Net deferred tax assets (liabilities)	[1]	(476)	(318)
Other Noncurrent Assets
Deferred tax assets/(liabilities):
Deferred tax assets		$ 400	$ 51

[1] (1)  Includes deferred tax assets of $400 million and $51 million at December 31, 2019 and 2018, respectively, reported in "Other assets" in the Consolidated Balance Sheets.