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Financial and Derivative Instruments - Effect of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments        
Pre-tax deferred losses $ 4 $ (29) $ 2 $ (31)
Commodity        
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments        
Effect of derivatives, gain (loss), net 69 (210) (16) (1,187)
Commodity | Sales and other operating revenues        
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments        
Effect of derivatives, gain (loss), net 78 (74) (19) (947)
Commodity | Purchased crude oil and products        
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments        
Effect of derivatives, gain (loss), net 1 (129) 19 (234)
Commodity | Other income        
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments        
Effect of derivatives, gain (loss), net $ (10) $ (7) $ (16) $ (6)