v3.26.3
SEGMENT INFORMATION - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Segment operating revenues $ 421 $ 855 $ 1,837 $ 2,745
Operating costs:        
Energy operating costs 123 92 320 273
Gas processing costs 6 6 17 15
Non-energy operating costs 257 218 761 639
General and administrative expenses 89 87 292 238
Depreciation, depletion and amortization 137 123 401 382
Taxes other than on income 81 70 214 187
Interest expense 26 25 83 77
Loss from investment in unconsolidated subsidiaries 1 2 5 3
Net gain on natural gas purchase derivatives (1) 27 28 24
Loss on early extinguishment of debt 0 0 (49) (1)
Other non-operating income, net (6) (4) (14) (9)
Other segment expenses 100 79 322 275
Segment profit or (loss) (407) 98 (607) 551
(Loss) income before income taxes (428) 75 (730) 479
Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 25 44 63 135
Electricity generation expenses        
Operating costs:        
Costs of sales 11 11 26 26
Operating Segments        
Segment Reporting [Line Items]        
Segment operating revenues       2,745
Operating Segments | Total Reportable Segments        
Segment Reporting [Line Items]        
Segment operating revenues 1,019 728 3,003 2,272
Operating costs:        
Energy operating costs 130 97 338 293
Gas processing costs 6 6 17 15
Non-energy operating costs 257 218 761 639
General and administrative expenses 13 13 59 40
Depreciation, depletion and amortization 130 118 381 365
Taxes other than on income 69 57 189 157
Interest expense 3 3 9 8
Loss from investment in unconsolidated subsidiaries 1 2 4 4
Net gain on natural gas purchase derivatives 0 0 0 0
Loss on early extinguishment of debt     0 0
Other non-operating income, net 0 0 0 0
Other segment expenses 64 53 213 175
Segment profit or (loss) 346 161 1,032 576
Operating Segments | Total Reportable Segments | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 0 0 0 0
Operating Segments | Total Reportable Segments | Electricity generation expenses        
Operating costs:        
Costs of sales 0 0 0 0
Operating Segments | Oil and Natural Gas        
Segment Reporting [Line Items]        
Segment operating revenues 1,017 728 3,000 2,272
Operating costs:        
Energy operating costs 130 97 338 293
Gas processing costs 6 6 17 15
Non-energy operating costs 257 218 761 639
General and administrative expenses 13 9 54 30
Depreciation, depletion and amortization 128 118 379 365
Taxes other than on income 69 57 189 157
Interest expense 0 0 0 0
Loss from investment in unconsolidated subsidiaries 0 0 0 0
Net gain on natural gas purchase derivatives 0 0 0 0
Loss on early extinguishment of debt     0 0
Other non-operating income, net 0 0 0 0
Other segment expenses 54 41 191 131
Segment profit or (loss) 360 182 1,071 642
Operating Segments | Oil and Natural Gas | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 0 0 0 0
Operating Segments | Oil and Natural Gas | Electricity generation expenses        
Operating costs:        
Costs of sales 0 0 0 0
Operating Segments | Carbon Management        
Segment Reporting [Line Items]        
Segment operating revenues 2 0 3 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 0 4 5 10
Depreciation, depletion and amortization 2 0 2 0
Taxes other than on income 0 0 0 0
Interest expense 3 3 9 8
Loss from investment in unconsolidated subsidiaries 1 2 4 4
Net gain on natural gas purchase derivatives 0 0 0 0
Loss on early extinguishment of debt     0 0
Other non-operating income, net 0 0 0 0
Other segment expenses 10 12 22 44
Segment profit or (loss) (14) (21) (39) (66)
Operating Segments | Carbon Management | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 0 0 0 0
Operating Segments | Carbon Management | Electricity generation expenses        
Operating costs:        
Costs of sales 0 0 0 0
Corporate/Eliminations/Other        
Segment Reporting [Line Items]        
Segment operating revenues (598) 127 (1,166) 473
Operating costs:        
Energy operating costs (7) (5) (18) (20)
Gas processing costs 0 0 0 0
Non-energy operating costs 0 0 0 0
General and administrative expenses 76 74 233 198
Depreciation, depletion and amortization 7 5 20 17
Taxes other than on income 12 13 25 30
Interest expense 23 22 74 69
Loss from investment in unconsolidated subsidiaries 0 0 1 (1)
Net gain on natural gas purchase derivatives (1) 27 28 24
Loss on early extinguishment of debt     (49) (1)
Other non-operating income, net (6) (4) (14) (9)
Other segment expenses 36 26 109 100
Segment profit or (loss) (774) (86) (1,762) (97)
Corporate/Eliminations/Other | Costs related to marketing of purchased commodities        
Operating costs:        
Costs of sales 25 44 63 135
Corporate/Eliminations/Other | Electricity generation expenses        
Operating costs:        
Costs of sales $ 11 $ 11 $ 26 $ 26