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Derivatives (Effect of Commodity Derivative Instruments in Statements of Income) (Detail) - Commodity derivatives - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) $ (74) $ 64
Sales and other operating revenues    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) 0 2
Cost of revenues    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) (74) 61
Other income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) $ 0 $ 1