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Hedging Activities and Fair Value Measurements - Schedule of Derivative Fair Value Amounts (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Commodity derivatives    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 460 $ 575
Liability Derivatives 363 495
Derivatives designated as hedging instruments:    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 429 232
Liability Derivatives 325 182
Derivatives designated as hedging instruments: | Commodity derivatives    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 429 232
Liability Derivatives 325 182
Derivatives designated as hedging instruments: | Commodity derivatives | Current assets    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 403 210
Derivatives designated as hedging instruments: | Commodity derivatives | Current liabilities    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 312 178
Derivatives designated as hedging instruments: | Commodity derivatives | Other assets    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 26 22
Derivatives designated as hedging instruments: | Commodity derivatives | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 13 4
Derivatives not designated as hedging instruments:    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 31 343
Liability Derivatives 38 313
Derivatives not designated as hedging instruments: | Commodity derivatives    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 31 343
Liability Derivatives 38 313
Derivatives not designated as hedging instruments: | Commodity derivatives | Current assets    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 31 324
Derivatives not designated as hedging instruments: | Commodity derivatives | Current liabilities    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 35 293
Derivatives not designated as hedging instruments: | Commodity derivatives | Other assets    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 0 19
Derivatives not designated as hedging instruments: | Commodity derivatives | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 3 $ 20