Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 9
Interest cost	80	83
Expected return on plan assets	(116)	(121)
Amortization:
Net loss (gain)	7	1
Prior service cost (credit)	1	1
Net periodic benefit cost (income)	(19)	(27)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4
Interest cost	16	17
Expected return on plan assets	(1)	(2)
Amortization:
Net loss (gain)	(1)	0
Prior service cost (credit)	(10)	(10)
Net periodic benefit cost (income)	$ 8	$ 9