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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
ScheduleOfCondensedFinancialStatements [Line Items]        
Total current assets $ 839 $ 929    
Total property, plant and equipment, net 2,793 2,770    
Investments in consolidated subsidiaries 0 0    
Deferred tax asset 139 132    
Investment in unconsolidated subsidiary 16 19    
Other assets 123 148    
TOTAL ASSETS 3,910 3,998    
Total current liabilities 594 616    
Long-term debt 541 540    
Asset retirement obligations 429 422    
Other long-term liabilities 253 201    
Amounts due to (from) affiliates 0      
Total equity 2,093 2,219 $ 2,092 $ 1,864
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 3,910 3,998    
Eliminations        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total current assets 0 0    
Total property, plant and equipment, net 0 0    
Investments in consolidated subsidiaries (3,669) (3,647)    
Deferred tax asset 0 0    
Investment in unconsolidated subsidiary 0 0    
Other assets 0 0    
TOTAL ASSETS (3,669) (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 (3,669) (3,647)    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (3,669) (3,647)    
Parent | Reportable Legal Entities        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total current assets 428 511    
Total property, plant and equipment, net 13 14    
Investments in consolidated subsidiaries 2,358 2,311    
Deferred tax asset 139 132    
Investment in unconsolidated subsidiary 0 0    
Other assets 12 12    
TOTAL ASSETS 2,950 2,980    
Total current liabilities 82 142    
Long-term debt 541 540    
Asset retirement obligations 0 0    
Other long-term liabilities 71 79    
Amounts due to (from) affiliates 163      
Total equity 2,093 2,219    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 2,950 2,980    
Combined Unrestricted Subsidiaries | Reportable Legal Entities        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total current assets 67 20    
Total property, plant and equipment, net 16 12    
Investments in consolidated subsidiaries (17) (11)    
Deferred tax asset 0 0    
Investment in unconsolidated subsidiary 16 19    
Other assets 50 36    
TOTAL ASSETS 132 76    
Total current liabilities 15 13    
Long-term debt 0 0    
Asset retirement obligations 0 0    
Other long-term liabilities 122 73    
Amounts due to (from) affiliates 24      
Total equity (29) (10)    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 132 76    
Combined Restricted Subsidiaries | Reportable Legal Entities        
ScheduleOfCondensedFinancialStatements [Line Items]        
Total current assets 344 398    
Total property, plant and equipment, net 2,764 2,744    
Investments in consolidated subsidiaries 1,328 1,347    
Deferred tax asset 0 0    
Investment in unconsolidated subsidiary 0 0    
Other assets 61 100    
TOTAL ASSETS 4,497 4,589    
Total current liabilities 497 461    
Long-term debt 0 0    
Asset retirement obligations 429 422    
Other long-term liabilities 60 49    
Amounts due to (from) affiliates (187)      
Total equity 3,698 3,657    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 4,497 $ 4,589