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Derivatives (Effect of Commodity Derivative Instruments in Statements of Income) (Detail) - Commodity derivatives - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) $ 16 $ (173) $ (324) $ (248)
Sales and other operating revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) 0 (5) 0 (15)
Cost of revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) 17 (168) (325) (233)
Other income        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) $ (1) $ 0 $ 1 $ 0