Derivatives (Effect Of Commodity Derivative Instruments In Statements Of Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Gain (Loss)	$ (58)	$ (380)	$ 107
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenues (excludes items below), Other income, Sales and other operating revenues	Cost of revenues (excludes items below), Other income, Sales and other operating revenues	Cost of revenues (excludes items below), Other income, Sales and other operating revenues
Sales and other operating revenues
Derivative [Line Items]
Gain (Loss)	$ 0	$ (47)	$ 72
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Sales and other operating revenues	Sales and other operating revenues	Sales and other operating revenues
Cost of revenues
Derivative [Line Items]
Gain (Loss)	$ (58)	$ (333)	$ 34
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenues (excludes items below)	Cost of revenues (excludes items below)	Cost of revenues (excludes items below)
Other income
Derivative [Line Items]
Gain (Loss)	$ 0	$ 0	$ 1
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income	Other income	Other income