v3.26.1
SEGMENT INFORMATION - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Segment operating revenues $ 119 $ 912
Operating costs:    
Energy operating costs 110 103
Gas processing costs 5 4
Non-energy operating costs 250 209
General and administrative expenses 106 72
Depreciation, depletion and amortization 133 131
Taxes other than on income 67 70
Interest expense 29 27
Equity loss from unconsolidated subsidiaries 2 1
Net loss (gain) from natural gas purchase derivatives 24 (6)
Loss on early extinguishment of debt 21 1
Other non-operating expenses (3) (5)
Other segment expenses 107 83
Segment profit or (loss) (711) 186
Loss before income taxes (760) 162
Costs related to marketing of purchased commodities    
Operating costs:    
Costs of sales 23 50
Electricity generation expenses    
Operating costs:    
Costs of sales 5 10
Operating Segments | Total Reportable Segments    
Segment Reporting Information [Line Items]    
Segment operating revenues 920 830
Operating costs:    
Energy operating costs 117 111
Gas processing costs 5 4
Non-energy operating costs 250 209
General and administrative expenses 26 15
Depreciation, depletion and amortization 128 126
Taxes other than on income 60 59
Interest expense 3 3
Equity loss from unconsolidated subsidiaries 1 1
Net loss (gain) from natural gas purchase derivatives 0 0
Loss on early extinguishment of debt 0 0
Other non-operating expenses 0 0
Other segment expenses 60 61
Segment profit or (loss) 270 241
Operating Segments | Total Reportable Segments | Costs related to marketing of purchased commodities    
Operating costs:    
Costs of sales 0 0
Operating Segments | Total Reportable Segments | Electricity generation expenses    
Operating costs:    
Costs of sales 0 0
Operating Segments | Oil and Natural Gas    
Segment Reporting Information [Line Items]    
Segment operating revenues 920 830
Operating costs:    
Energy operating costs 117 111
Gas processing costs 5 4
Non-energy operating costs 250 209
General and administrative expenses 23 12
Depreciation, depletion and amortization 128 126
Taxes other than on income 60 59
Interest expense 0 0
Equity loss from unconsolidated subsidiaries 0 0
Net loss (gain) from natural gas purchase derivatives 0 0
Loss on early extinguishment of debt 0 0
Other non-operating expenses 0 0
Other segment expenses 55 43
Segment profit or (loss) 282 266
Operating Segments | Oil and Natural Gas | Costs related to marketing of purchased commodities    
Operating costs:    
Costs of sales 0 0
Operating Segments | Oil and Natural Gas | Electricity generation expenses    
Operating costs:    
Costs of sales 0 0
Operating Segments | Carbon Management    
Segment Reporting Information [Line Items]    
Segment operating revenues 0 0
Operating costs:    
Energy operating costs 0 0
Gas processing costs 0 0
Non-energy operating costs 0 0
General and administrative expenses 3 3
Depreciation, depletion and amortization 0 0
Taxes other than on income 0 0
Interest expense 3 3
Equity loss from unconsolidated subsidiaries 1 1
Net loss (gain) from natural gas purchase derivatives 0 0
Loss on early extinguishment of debt 0 0
Other non-operating expenses 0 0
Other segment expenses 5 18
Segment profit or (loss) (12) (25)
Operating Segments | Carbon Management | Costs related to marketing of purchased commodities    
Operating costs:    
Costs of sales 0 0
Operating Segments | Carbon Management | Electricity generation expenses    
Operating costs:    
Costs of sales 0 0
Corporate/Eliminations/Other    
Segment Reporting Information [Line Items]    
Segment operating revenues (801) 82
Operating costs:    
Energy operating costs (7) (8)
Gas processing costs 0 0
Non-energy operating costs 0 0
General and administrative expenses 80 57
Depreciation, depletion and amortization 5 5
Taxes other than on income 7 11
Interest expense 26 24
Equity loss from unconsolidated subsidiaries 1 0
Net loss (gain) from natural gas purchase derivatives 24 (6)
Loss on early extinguishment of debt 21 1
Other non-operating expenses (3) (5)
Other segment expenses 47 22
Segment profit or (loss) (1,030) (79)
Corporate/Eliminations/Other | Costs related to marketing of purchased commodities    
Operating costs:    
Costs of sales 23 50
Corporate/Eliminations/Other | Electricity generation expenses    
Operating costs:    
Costs of sales $ 5 $ 10