Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Less: Loss Reclassified into Income	$ (14)	$ (5)	$ (21)	$ (8)
Loss Recognized in AOCL	(53)	16	(118)	(24)
Less: Loss Reclassified into Income	(8)	(4)	(13)	(6)
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			(2)		(4)
Pre-Tax Balance at End of Period	(7)		(7)		(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	0	$ 0	(1)	$ (1)	(3)
After-Tax Balance at End of Period	$ (5)		$ (5)		$ (6)