Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Less: Loss Reclassified into Income	$ (15)	$ (2)	$ (36)	$ (10)
Loss Recognized in AOCL	(48)	(4)	(166)	(28)
Less: Loss Reclassified into Income	(10)	(2)	(23)	(8)
Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Pre-Tax Balance at Beginning of Period			(9)	(13)	$ (13)
Loss Recognized in AOCL			0		0
Less: Loss Reclassified into Income			(3)		(4)
Pre-Tax Balance at End of Period	(6)		(6)		(9)
After-Tax Balance at Beginning of Period			(6)	(9)	(9)
Loss Recognized in AOCL	0	0	0	0	0
Less: Loss Reclassified into Income	(1)	$ (1)	(2)	$ (2)	(3)
After-Tax Balance at End of Period	$ (4)		$ (4)		$ (6)