Derivatives (Classification Of Gross Fair Values Of Derivative Instruments, Excluding Cash Collateral) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Commodity derivative instruments | Other current assets
Derivatives, Fair Value [Line Items]
Asset		$ 310	$ 271
Liability		301	249
Embedded derivative in commodity contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Asset		0	0
Liability	[1]	10	15
Embedded derivative in commodity contracts | Deferred credits and other liabilities
Derivatives, Fair Value [Line Items]
Asset		0	0
Liability	[1]	$ 51	$ 93

[1] Includes embedded derivatives.