GENERAL INFORMATION AND OTHER FINANCIAL DATA - CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020		Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 335	$ 960	[1]
Restricted cash, current	33	22	[1]
Restricted cash, noncurrent	3	3	[1]
Total cash, cash equivalents and restricted cash on the Condensed Consolidated Statements of Cash Flows	$ 371	$ 985		$ 4,930	$ 217

[1] Derived from audited financial statements.