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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Cash Flow Statement (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash (used) provided by operating activities $ 676 $ 461 $ 248
Net cash used in investing activities (394) (1,156) (313)
Net cash provided (used) by financing activities (282) 692 73
(Decrease) increase in cash 0 (3) 8
Cash—beginning of year 17 20 12
Cash—end of year 17 17 20
Eliminations      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash (used) provided by operating activities 0 0 0
Net cash used in investing activities 0 0 0
Net cash provided (used) by financing activities 0 0 0
(Decrease) increase in cash 0 0 0
Cash—beginning of year 0 0 0
Cash—end of year 0 0 0
Parent | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash (used) provided by operating activities (673) (633) (481)
Net cash used in investing activities (15) (8) (4)
Net cash provided (used) by financing activities 688 634 492
(Decrease) increase in cash 0 (7) 7
Cash—beginning of year 0 7 0
Cash—end of year 0 0 7
Combined Guarantor Subsidiaries | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash (used) provided by operating activities 1,082 1,374 718
Net cash used in investing activities (378) (1,138) (212)
Net cash provided (used) by financing activities (705) (237) (510)
(Decrease) increase in cash (1) (1) (4)
Cash—beginning of year 7 8 12
Cash—end of year 6 7 8
Combined Non-Guarantor Subsidiaries | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash (used) provided by operating activities 267 (280) 11
Net cash used in investing activities (1) (10) (97)
Net cash provided (used) by financing activities (265) 295 91
(Decrease) increase in cash 1 5 5
Cash—beginning of year 10 5 0
Cash—end of year $ 11 $ 10 $ 5