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CONDENSED COMBINED DEBTOR-IN-POSSESSION FINANCIAL INFORMATION - Condensed Consolidating Debtors' Statement of Cash Flows (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash used in operating activities $ 141 $ 540
Net cash used in investing activities (28) (291)
Net cash provided by financing activities (8) (244)
Increase in cash 105 5
Cash—beginning of period 17 17
Cash—end of period 122 $ 22
Parent Company And Subsidiaries In Debtor In Possession Financing    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash used in operating activities (38)  
Net cash used in investing activities (1)  
Net cash provided by financing activities 31  
Increase in cash (8)  
Cash—beginning of period 105  
Cash—end of period $ 97