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Hedging Activities and Fair Value Measurements - Schedule of Recurring Fair Value Measurements (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Commodity derivatives:    
Impact of CME Rule 814 $ (489) $ (223)
Total commodity derivatives 460 575
Total 460 575
Commodity derivatives:    
Impact of CME Rule 814 (379) (221)
Total commodity derivatives 363 495
Total 363 495
Value before application of CME Rule 814    
Commodity derivatives:    
Total commodity derivatives 949 798
Commodity derivatives:    
Total commodity derivatives 742 716
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)    
Commodity derivatives:    
Impact of CME Rule 814 (170) (56)
Total commodity derivatives 2 299
Total 2 299
Commodity derivatives:    
Impact of CME Rule 814 (31) (43)
Total commodity derivatives 1 248
Total 1 248
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Value before application of CME Rule 814    
Commodity derivatives:    
Total commodity derivatives 172 355
Commodity derivatives:    
Total commodity derivatives 32 291
Significant Other Observable Inputs (Level 2)    
Commodity derivatives:    
Impact of CME Rule 814 (319) (167)
Total commodity derivatives 458 276
Total 458 276
Commodity derivatives:    
Impact of CME Rule 814 (348) (157)
Total commodity derivatives 362 247
Total 362 247
Significant Other Observable Inputs (Level 2) | Value before application of CME Rule 814    
Commodity derivatives:    
Total commodity derivatives 777 443
Commodity derivatives:    
Total commodity derivatives 710 404
Significant Unobservable Inputs (Level 3)    
Commodity derivatives:    
Impact of CME Rule 814 0 0
Total commodity derivatives 0 0
Total 0 0
Commodity derivatives:    
Impact of CME Rule 814 0 (21)
Total commodity derivatives 0 0
Total 0 0
Significant Unobservable Inputs (Level 3) | Value before application of CME Rule 814    
Commodity derivatives:    
Total commodity derivatives 0 0
Commodity derivatives:    
Total commodity derivatives $ 0 $ 21