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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities $ 93 $ 272
Net cash provided by (used in) investing activities (27) (170)
Net cash provided by (used in) financing activities 43 (92)
Increase in cash 109 10
Cash—beginning of period 17 17
Cash—end of period 126 27
Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 0 0
Net cash provided by (used in) investing activities 0 0
Net cash provided by (used in) financing activities 0 0
Increase in cash 0 0
Cash—beginning of period 0 0
Cash—end of period 0 0
Parent | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (338) (348)
Net cash provided by (used in) investing activities 1 (5)
Net cash provided by (used in) financing activities 340 353
Increase in cash 3 0
Cash—beginning of period 0 0
Cash—end of period 3 0
Combined Guarantor Subsidiaries | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 277 303
Net cash provided by (used in) investing activities (28) (154)
Net cash provided by (used in) financing activities (153) (149)
Increase in cash 96 0
Cash—beginning of period 6 7
Cash—end of period 102 7
Combined Non-Guarantor Subsidiaries | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 154 317
Net cash provided by (used in) investing activities 0 (11)
Net cash provided by (used in) financing activities (144) (296)
Increase in cash 10 10
Cash—beginning of period 11 10
Cash—end of period $ 21 $ 20