v3.26.1
CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Schedule of Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Condensed Financial Statements [Line Items]        
Total current assets $ 788 $ 938    
Total property, plant and equipment, net 5,904 5,905    
Investments in consolidated subsidiaries 0 0    
Deferred tax asset 81 76    
Investment in unconsolidated subsidiaries 102 111    
Other assets 274 373    
TOTAL ASSETS 7,149 7,403    
Total current liabilities 1,441 1,050    
Long-term debt 1,310 1,283    
Fair value of derivative contracts 169 17    
Asset retirement obligations 906 913    
Other long-term liabilities 297 312    
Deferred tax liability 108 154    
Amounts due to (from) affiliates 0 0    
Total equity 2,918 3,674 $ 3,516 $ 3,538
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 7,149 7,403    
Eliminations        
Condensed Financial Statements [Line Items]        
Total current assets 0 0    
Total property, plant and equipment, net 0 0    
Investments in consolidated subsidiaries (17,565) (24,627)    
Deferred tax asset 0 0    
Investment in unconsolidated subsidiaries 0 0    
Other assets 0 0    
TOTAL ASSETS (17,565) (24,627)    
Total current liabilities 0 0    
Long-term debt 0 0    
Fair value of derivative contracts 0 0    
Asset retirement obligations 0 0    
Other long-term liabilities 0 0    
Deferred tax liability 0 0    
Amounts due to (from) affiliates 0 0    
Total equity (17,565) (24,627)    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (17,565) (24,627)    
Parent | Reportable Legal Entities        
Condensed Financial Statements [Line Items]        
Total current assets 120 203    
Total property, plant and equipment, net 27 27    
Investments in consolidated subsidiaries 4,519 6,579    
Deferred tax asset 81 76    
Investment in unconsolidated subsidiaries 0 0    
Other assets 22 22    
TOTAL ASSETS 4,769 6,907    
Total current liabilities 173 180    
Long-term debt 1,310 1,283    
Fair value of derivative contracts 0 0    
Asset retirement obligations 0 0    
Other long-term liabilities 106 110    
Deferred tax liability 108 154    
Amounts due to (from) affiliates 154 1,508    
Total equity 2,918 3,674    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 4,769 6,909    
Combined Unrestricted Subsidiaries | Reportable Legal Entities        
Condensed Financial Statements [Line Items]        
Total current assets 25 20    
Total property, plant and equipment, net 408 21    
Investments in consolidated subsidiaries 322 (51)    
Deferred tax asset 0 0    
Investment in unconsolidated subsidiaries 59 57    
Other assets 51 31    
TOTAL ASSETS 865 78    
Total current liabilities 10 6    
Long-term debt 0 0    
Fair value of derivative contracts 0 0    
Asset retirement obligations 0 0    
Other long-term liabilities 129 130    
Deferred tax liability 0 0    
Amounts due to (from) affiliates 29 61    
Total equity 697 (120)    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 865 77    
Combined Restricted Subsidiaries | Reportable Legal Entities        
Condensed Financial Statements [Line Items]        
Total current assets 643 715    
Total property, plant and equipment, net 5,469 5,857    
Investments in consolidated subsidiaries 12,724 18,099    
Deferred tax asset 0 0    
Investment in unconsolidated subsidiaries 43 54    
Other assets 201 320    
TOTAL ASSETS 19,080 25,045    
Total current liabilities 1,258 864    
Long-term debt 0 0    
Fair value of derivative contracts 169 17    
Asset retirement obligations 906 913    
Other long-term liabilities 62 72    
Deferred tax liability 0 0    
Amounts due to (from) affiliates (183) (1,569)    
Total equity 16,868 24,747    
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 19,080 $ 25,044