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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Statement of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
ScheduleOfCondensedFinancialStatements [Line Items]        
Total operating revenues $ 514 $ 591 $ 968 $ 1,615
Total costs and other 477 444 941 1,082
Gain on asset divestitures 1 0 7 7
Non-operating income (loss) (27) (12) (42) (29)
INCOME (LOSS) BEFORE INCOME TAXES 11 135 (8) 511
Income tax provision 3 38 (6) 113
NET INCOME (LOSS) 8 97 (2) 398
Eliminations        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total operating revenues (6) 0 (16) 0
Total costs and other (6) 0 (16) 0
Gain on asset divestitures 0   0 0
Non-operating income (loss) 0 0 0 0
INCOME (LOSS) BEFORE INCOME TAXES 0 0 0 0
Income tax provision 0 0 0 0
NET INCOME (LOSS) 0 0 0 0
Parent | Reportable Legal Entities        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total operating revenues 7 5 13 9
Total costs and other 77 62 136 112
Gain on asset divestitures 0   0 0
Non-operating income (loss) (21) (11) (34) (27)
INCOME (LOSS) BEFORE INCOME TAXES (91) (68) (157) (130)
Income tax provision 3 38 (6) 113
NET INCOME (LOSS) (94) (106) (151) (243)
Combined Unrestricted Subsidiaries | Reportable Legal Entities        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total operating revenues 0 0 0 0
Total costs and other 18 11 28 19
Gain on asset divestitures 0   0 0
Non-operating income (loss) (7) (2) (11) (5)
INCOME (LOSS) BEFORE INCOME TAXES (25) (13) (39) (24)
Income tax provision 0 0 0 0
NET INCOME (LOSS) (25) (13) (39) (24)
Combined Restricted Subsidiaries | Reportable Legal Entities        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total operating revenues 513 586 971 1,606
Total costs and other 388 371 793 951
Gain on asset divestitures 1   7 7
Non-operating income (loss) 1 1 3 3
INCOME (LOSS) BEFORE INCOME TAXES 127 216 188 665
Income tax provision 0 0 0 0
NET INCOME (LOSS) $ 127 $ 216 $ 188 $ 665