Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Derivatives Fair Value [Line Items]
Gross Fair Value	$ (908)	$ (569)
Net Fair Value	(908)	(569)
Short-term Derivative Asset [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	15	6
Amounts Netted	(14)	(4)
Net Fair Value	$ 1	2
Balance Sheet Classification	Other current assets
Long-term Derivative Asset [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	$ 31	6
Net Fair Value	$ 31	6
Balance Sheet Classification	Other long-term assets
Short-term Derivative Liability [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	$ (953)	(579)
Amounts Netted	14	4
Net Fair Value	$ (939)	(575)
Balance Sheet Classification	Other current liabilities
Long-term Derivative Liability [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	$ (1)	(2)
Net Fair Value	$ (1)	$ (2)
Balance Sheet Classification	Other long-term liabilities