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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents The following table reconciles cash and cash equivalents and restricted cash and cash equivalents reported in the Consolidated Balance Sheets to the total amount shown in the Consolidated Statements of Cash Flows (in millions):  
 
 
December 31,
 
 
2019
 
2018
 
2017
As included in the Consolidated Balance Sheets:
 
 
 
 
 
 
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