v3.26.1
CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Schedule of Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Condensed Financial Statements [Line Items]            
Total current assets $ 697   $ 938      
Total property, plant and equipment, net 5,923   5,905      
Investments in consolidated subsidiaries 0   0      
Deferred tax asset 100   76      
Investment in unconsolidated subsidiaries 98   111      
Other assets 285   373      
TOTAL ASSETS 7,103   7,403      
Total current liabilities 1,055   1,050      
Long-term debt 1,281   1,283      
Fair value of derivative contracts 70   17      
Asset retirement obligations 923   913      
Other long-term liabilities 299   312      
Deferred tax liability 73   154      
Amounts due to (from) affiliates 0   0      
Total equity 3,402 $ 2,918 3,674 $ 3,407 $ 3,516 $ 3,538
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 7,103   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 (18,926)   (24,627)      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiaries 0   0      
Other assets 0   0      
TOTAL ASSETS (18,926)   (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 (18,926)   (24,627)      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (18,926)   (24,627)      
Parent | Reportable Legal Entities            
Condensed Financial Statements [Line Items]            
Total current assets 145   203      
Total property, plant and equipment, net 27   27      
Investments in consolidated subsidiaries 5,127   6,579      
Deferred tax asset 100   76      
Investment in unconsolidated subsidiaries 0   0      
Other assets 20   22      
TOTAL ASSETS 5,419   6,907      
Total current liabilities 187   180      
Long-term debt 1,281   1,283      
Fair value of derivative contracts 0   0      
Asset retirement obligations 0   0      
Other long-term liabilities 105   110      
Deferred tax liability 73   154      
Amounts due to (from) affiliates 371   1,508      
Total equity 3,402   3,674      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 5,419   6,909      
Combined Unrestricted Subsidiaries | Reportable Legal Entities            
Condensed Financial Statements [Line Items]            
Total current assets 26   20      
Total property, plant and equipment, net 403   21      
Investments in consolidated subsidiaries (55)   (51)      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiaries 55   57      
Other assets 48   31      
TOTAL ASSETS 477   78      
Total current liabilities 9   6      
Long-term debt 0   0      
Fair value of derivative contracts 0   0      
Asset retirement obligations 0   0      
Other long-term liabilities 132   130      
Deferred tax liability 0   0      
Amounts due to (from) affiliates 48   61      
Total equity 288   (120)      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 477   77      
Combined Restricted Subsidiaries | Reportable Legal Entities            
Condensed Financial Statements [Line Items]            
Total current assets 526   715      
Total property, plant and equipment, net 5,493   5,857      
Investments in consolidated subsidiaries 13,854   18,099      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiaries 43   54      
Other assets 217   320      
TOTAL ASSETS 20,133   25,045      
Total current liabilities 859   864      
Long-term debt 0   0      
Fair value of derivative contracts 70   17      
Asset retirement obligations 923   913      
Other long-term liabilities 62   72      
Deferred tax liability 0   0      
Amounts due to (from) affiliates (419)   (1,569)      
Total equity 18,638   24,747      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 20,133   $ 25,044