Derivatives (Classification Of Gross Fair Values Of Derivative Instruments, Excluding Cash Collateral) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Commodity derivative instruments | Other current assets
Derivatives, Fair Value [Line Items]
Asset	$ 139	$ 244
Liability	144	249
Embedded derivative in commodity contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Asset	0	0
Liability	10	11
Embedded derivative in commodity contracts | Deferred credits and other liabilities
Derivatives, Fair Value [Line Items]
Asset	0	0
Liability	$ 48	$ 50