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Financial Instruments - Fair Value of Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Asset Derivatives $ 824 $ 2,899
Liability Derivatives 1,491 1,725
Net asset variation margin balances for future contracts 230 263
Other current assets    
Derivative [Line Items]    
Asset Derivatives 657 2,545
Other assets    
Derivative [Line Items]    
Asset Derivatives 167 354
Other current liabilities    
Derivative [Line Items]    
Liability Derivatives 1,046 1,641
Other liabilities    
Derivative [Line Items]    
Liability Derivatives $ 445 $ 84