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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
ScheduleOfCondensedFinancialStatements [Line Items]            
Total current assets $ 1,439   $ 929      
Total property, plant and equipment, net 2,773   2,770      
Investments in consolidated subsidiaries 0   0      
Deferred tax asset 139   132      
Investment in unconsolidated subsidiary 17   19      
Other assets 122   148      
TOTAL ASSETS 4,490   3,998      
Total current liabilities 593   616      
Long-term debt 1,161   540      
Asset retirement obligations 436   422      
Other long-term liabilities 248   201      
Amounts due to (from) affiliates 0          
Total equity 2,052 $ 2,093 2,219 $ 2,110 $ 2,092 $ 1,864
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 4,490   3,998      
Eliminations            
ScheduleOfCondensedFinancialStatements [Line Items]            
Total current assets 0   0      
Total property, plant and equipment, net 0   0      
Investments in consolidated subsidiaries (3,794)   (3,647)      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiary 0   0      
Other assets 0   0      
TOTAL ASSETS (3,794)   (3,647)      
Total current liabilities 0   0      
Long-term debt 0   0      
Asset retirement obligations 0   0      
Other long-term liabilities 0   0      
Amounts due to (from) affiliates 0          
Total equity (3,794)   (3,647)      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (3,794)   (3,647)      
Parent | Reportable Legal Entities            
ScheduleOfCondensedFinancialStatements [Line Items]            
Total current assets 1,055   511      
Total property, plant and equipment, net 13   14      
Investments in consolidated subsidiaries 2,461   2,311      
Deferred tax asset 139   132      
Investment in unconsolidated subsidiary 0   0      
Other assets 14   12      
TOTAL ASSETS 3,682   2,980      
Total current liabilities 117   142      
Long-term debt 1,161   540      
Asset retirement obligations 0   0      
Other long-term liabilities 72   79      
Amounts due to (from) affiliates 280          
Total equity 2,052   2,219      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 3,682   2,980      
Combined Unrestricted Subsidiaries | Reportable Legal Entities            
ScheduleOfCondensedFinancialStatements [Line Items]            
Total current assets 61   20      
Total property, plant and equipment, net 21   12      
Investments in consolidated subsidiaries (28)   (11)      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiary 17   19      
Other assets 49   36      
TOTAL ASSETS 120   76      
Total current liabilities 15   13      
Long-term debt 0   0      
Asset retirement obligations 0   0      
Other long-term liabilities 126   73      
Amounts due to (from) affiliates 44          
Total equity (65)   (10)      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 120   76      
Combined Restricted Subsidiaries | Reportable Legal Entities            
ScheduleOfCondensedFinancialStatements [Line Items]            
Total current assets 323   398      
Total property, plant and equipment, net 2,739   2,744      
Investments in consolidated subsidiaries 1,361   1,347      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiary 0   0      
Other assets 59   100      
TOTAL ASSETS 4,482   4,589      
Total current liabilities 461   461      
Long-term debt 0   0      
Asset retirement obligations 436   422      
Other long-term liabilities 50   49      
Amounts due to (from) affiliates (324)          
Total equity 3,859   3,657      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 4,482   $ 4,589