v3.26.3
CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Schedule of Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Condensed Financial Statements [Line Items]            
Total current assets $ 820   $ 938      
Total property, plant and equipment, net 5,975   5,905      
Investments in consolidated subsidiaries 0   0      
Deferred tax asset 134   76      
Investment in unconsolidated subsidiaries 98   111      
Other assets 288   373      
TOTAL ASSETS 7,315   7,403      
Total current liabilities 1,622   1,050      
Long-term debt 1,281   1,283      
Fair value of derivative contracts 140   17      
Asset retirement obligations 888   913      
Other long-term liabilities 353   312      
Deferred tax liability 6   154      
Amounts due to (from) affiliates 0   0      
Total equity 3,025 $ 3,402 3,674 $ 3,443 $ 3,407 $ 3,538
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 7,315   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 (7,403)   (24,627)      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiaries 0   0      
Other assets 0   0      
TOTAL ASSETS (7,403)   (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 (7,403)   (24,627)      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (7,403)   (24,627)      
Parent | Reportable Legal Entities            
Condensed Financial Statements [Line Items]            
Total current assets 125   203      
Total property, plant and equipment, net 42   27      
Investments in consolidated subsidiaries 4,869   6,579      
Deferred tax asset 134   76      
Investment in unconsolidated subsidiaries 0   0      
Other assets 37   22      
TOTAL ASSETS 5,207   6,907      
Total current liabilities 184   180      
Long-term debt 1,281   1,283      
Fair value of derivative contracts 0   0      
Asset retirement obligations 0   0      
Other long-term liabilities 104   110      
Deferred tax liability 6   154      
Amounts due to (from) affiliates 607   1,508      
Total equity 3,025   3,674      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 5,207   6,909      
Combined Unrestricted Subsidiaries | Reportable Legal Entities            
Condensed Financial Statements [Line Items]            
Total current assets 31   20      
Total property, plant and equipment, net 395   21      
Investments in consolidated subsidiaries (60)   (51)      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiaries 55   57      
Other assets 34   31      
TOTAL ASSETS 455   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 135   130      
Deferred tax liability 0   0      
Amounts due to (from) affiliates 57   61      
Total equity 254   (120)      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 455   77      
Combined Restricted Subsidiaries | Reportable Legal Entities            
Condensed Financial Statements [Line Items]            
Total current assets 664   715      
Total property, plant and equipment, net 5,538   5,857      
Investments in consolidated subsidiaries 2,594   18,099      
Deferred tax asset 0   0      
Investment in unconsolidated subsidiaries 43   54      
Other assets 217   320      
TOTAL ASSETS 9,056   25,045      
Total current liabilities 1,429   864      
Long-term debt 0   0      
Fair value of derivative contracts 140   17      
Asset retirement obligations 888   913      
Other long-term liabilities 114   72      
Deferred tax liability 0   0      
Amounts due to (from) affiliates (664)   (1,569)      
Total equity 7,149   24,747      
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 9,056   $ 25,044