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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

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