SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Cash and cash equivalents	$ 6,312	$ 2,624	$ 2,542
Restricted cash and cash equivalents included in prepaid expenses and other current assets	20	21	21
Total cash and cash equivalents and restricted cash and cash equivalents as shown in the Consolidated Statements of Cash Flows	$ 6,332	$ 2,645	$ 2,563	$ 2,082