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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities $ 228 $ 158
Net cash provided by (used in) investing activities (12) (182)
Net cash provided by (used in) financing activities (156) 50
Increase in cash 60 26
Cash—beginning of period 17 17
Cash—end of period 77 43
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 (188) (184)
Net cash provided by (used in) investing activities 1 0
Net cash provided by (used in) financing activities 187 184
Increase in cash 0 0
Cash—beginning of period 0 0
Cash—end of period 0 0
Combined Guarantor Subsidiaries | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 334 267
Net cash provided by (used in) investing activities (13) (182)
Net cash provided by (used in) financing activities (260) (83)
Increase in cash 61 2
Cash—beginning of period 6 7
Cash—end of period 67 9
Combined Non-Guarantor Subsidiaries | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 82 75
Net cash provided by (used in) investing activities 0 0
Net cash provided by (used in) financing activities (83) (51)
Increase in cash (1) 24
Cash—beginning of period 11 10
Cash—end of period $ 10 $ 34