Derivatives (Effect Of Commodity Derivative Instruments In Statements Of Income) (Details) - Commodity Contract [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	$ (91)	$ (6)	$ (58)
Sales and other operating revenues
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	1	7	0
Cost of revenues
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	(94)	(15)	(58)
Other income
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	$ 2	$ 2	$ 0