v3.26.1
SEGMENT INFORMATION - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Segment operating revenues $ 1,297 $ 978 $ 1,416 $ 1,890
Operating costs:        
Energy operating costs 87 78 197 181
Gas processing costs 6 5 11 9
Non-energy operating costs 254 212 504 421
General and administrative expenses 97 79 203 151
Depreciation, depletion and amortization 131 128 264 259
Taxes other than on income 66 47 133 117
Interest expense 28 25 57 52
Equity loss from unconsolidated subsidiaries 2 0 4 1
Net loss (gain) from natural gas purchase derivatives 5 3 29 (3)
Loss on early extinguishment of debt 28 0 49 1
Other non-operating income (5) 0 (8) (5)
Other segment expenses 115 113 222 196
Segment profit or (loss) 511 267 (200) 453
Income before income taxes 458 242 (302) 404
Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 15 41 38 91
Electricity generation expenses        
Operating costs:        
Costs of sales 10 5 15 15
Operating Segments        
Segment Reporting [Line Items]        
Segment operating revenues       1,890
Operating Segments | Total Reportable Segments        
Segment Reporting [Line Items]        
Segment operating revenues 1,064 714 1,984 1,544
Operating costs:        
Energy operating costs 91 85 208 196
Gas processing costs 6 5 11 9
Non-energy operating costs 254 212 504 421
General and administrative expenses 20 12 46 27
Depreciation, depletion and amortization 124 121 251 247
Taxes other than on income 61 41 120 100
Interest expense 3 2 6 5
Equity loss from unconsolidated subsidiaries 2 1 3 2
Net loss (gain) from natural gas purchase derivatives 0 0 0 0
Loss on early extinguishment of debt 0   0
Other non-operating income 0   0
Other segment expenses 89 61 149 122
Segment profit or (loss) 414 174 686 415
Operating Segments | Total Reportable Segments | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 0 0 0
Operating Segments | Total Reportable Segments | Electricity generation expenses        
Operating costs:        
Costs of sales 0 0 0
Operating Segments | Oil and Natural Gas        
Segment Reporting [Line Items]        
Segment operating revenues 1,063 714 1,983 1,544
Operating costs:        
Energy operating costs 91 85 208 196
Gas processing costs 6 5 11 9
Non-energy operating costs 254 212 504 421
General and administrative expenses 18 9 41 21
Depreciation, depletion and amortization 124 121 251 247
Taxes other than on income 61 41 120 100
Interest expense 0 0 0 0
Equity loss from unconsolidated subsidiaries 0 0 0 0
Net loss (gain) from natural gas purchase derivatives 0 0 0 0
Loss on early extinguishment of debt 0   0
Other non-operating income 0   0
Other segment expenses 82 47 137 90
Segment profit or (loss) 427 194 711 460
Operating Segments | Oil and Natural Gas | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 0 0 0
Operating Segments | Oil and Natural Gas | Electricity generation expenses        
Operating costs:        
Costs of sales 0 0 0
Operating Segments | Carbon Management        
Segment Reporting [Line Items]        
Segment operating revenues 1 0 1 0
Operating costs:        
Energy operating costs 0 0 0 0
Gas processing costs 0 0 0 0
Non-energy operating costs 0 0 0 0
General and administrative expenses 2 3 5 6
Depreciation, depletion and amortization 0 0 0 0
Taxes other than on income 0 0 0 0
Interest expense 3 2 6 5
Equity loss from unconsolidated subsidiaries 2 1 3 2
Net loss (gain) from natural gas purchase derivatives 0 0 0
Loss on early extinguishment of debt 0   0
Other non-operating income 0   0
Other segment expenses 7 14 12 32
Segment profit or (loss) (13) (20) (25) (45)
Operating Segments | Carbon Management | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 0 0 0
Operating Segments | Carbon Management | Electricity generation expenses        
Operating costs:        
Costs of sales 0 0 0
Corporate/Eliminations/Other        
Segment Reporting [Line Items]        
Segment operating revenues 233 264 (568) 346
Operating costs:        
Energy operating costs (4) (7) (11) (15)
Gas processing costs 0 0 0 0
Non-energy operating costs 0 0 0 0
General and administrative expenses 77 67 157 124
Depreciation, depletion and amortization 7 7 13 12
Taxes other than on income 5 6 13 17
Interest expense 25 23 51 47
Equity loss from unconsolidated subsidiaries 0 (1) 1 (1)
Net loss (gain) from natural gas purchase derivatives 5 3 29 (3)
Loss on early extinguishment of debt 28   49 1
Other non-operating income (5)   (8) (5)
Other segment expenses 26 52 73 74
Segment profit or (loss) 44 68 (988) (11)
Corporate/Eliminations/Other | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 15 41 38 91
Corporate/Eliminations/Other | Electricity generation expenses        
Operating costs:        
Costs of sales $ 10 $ 5 $ 15 $ 15