Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives Fair Value [Line Items]
Gross Fair Value	$ 30	$ 199
Amounts Netted	0	0
Net Fair Value	30	199
Short-term Derivative Asset [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	82	213
Amounts Netted	(8)	(5)
Net Fair Value	74	208
Long-term Derivative Asset [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	1	0
Amounts Netted	(1)	0
Net Fair Value	0	0
Short-term Derivative Liability [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	(46)	(7)
Amounts Netted	8	5
Net Fair Value	(38)	(2)
Long-term Derivative Liability [Member]
Derivatives Fair Value [Line Items]
Gross Fair Value	(7)	(7)
Amounts Netted	1	0
Net Fair Value	$ (6)	$ (7)