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CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Tables)
 6 Months Ended
Jun. 30, 2018
Cash And Cash Equivalents [Abstract]  
Reconciliation of Cash, Cash Equivalents, and Restricted Cash

The following is a reconciliation of cash, cash equivalents and restricted cash reported within the Balance Sheets that sum to the totals of such amounts shown in the Statements of Cash Flows at June 30, 2018 and December 31, 2017:  

 

 

 

June 30, 2018

 

 

December 31, 2017

 

 

 

(In millions)

 

Cash and cash equivalents

 

$

814

 

 

$

390

 

Restricted cash and cash equivalents (1)

 

 

324

 

 

 

18

 

Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows

 

$

1,138

 

 

$

408

 

 

(1)

Our restricted cash balances primarily served as cash collateral deposits for our letter of credit facilities. See Note 12, Debt for further discussion.