INCOME TAXES - Net Deferred Tax Assets/(Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets/(liabilities):
Net operating loss carryforward — U.S.		$ 88	$ 67
Net operating loss carryforward — International		137	81
Accrued expenses		50	47
Stock-based compensation and other stock based payments		50	40
Foreign currency translation adjustment		48	29
Tax credits		19	9
Euro-denominated debt		0	77
Operating lease liabilities		38	43
Property and equipment		95	11
Other		11	0
Subtotal - deferred tax assets		536	404
Discount on convertible notes		(20)	(29)
Intangible assets and other		(192)	(119)
Euro-denominated debt		(20)	0
State income tax on accumulated unremitted international earnings		(8)	(5)
Unrealized gains on investments		(417)	(550)
Operating lease assets		(37)	(38)
Installment sale liability		(156)	(263)
Other		0	(14)
Subtotal - deferred tax liabilities		(850)	(1,018)
Valuation allowance on deferred tax assets		(37)	(58)
Net deferred tax liabilities	[1]	(351)	(672)
Other assets, net
Deferred tax assets/(liabilities):
Deferred tax assets		$ 554	$ 455

[1] Includes deferred tax assets of $554 million and $455 million at December 31, 2021 and 2020, respectively, reported in "Other assets, net" in the Consolidated Balance Sheets.