AVAILABLE-FOR-SALE DEBT SECURITIES - Summary of the Balance Sheet Classification of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Available-for-Sale Debt Securities
Total	$ 2,523	$ 2,026
Cash and cash equivalents
Available-for-Sale Debt Securities
Total	55	113
Short-term marketable securities
Available-for-Sale Debt Securities
Total	1,632	1,411
Long-term marketable securities
Available-for-Sale Debt Securities
Total	$ 836	$ 502

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant