Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 15
Interest cost	83	52
Expected return on plan assets	(121)	(123)
Amortization:
Net loss	1	24
Prior service cost (credit)	1	2
Net periodic benefit cost (income)	(27)	(30)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	5
Interest cost	17	10
Expected return on plan assets	(2)	(3)
Amortization:
Net loss	0	4
Prior service cost (credit)	(10)	(12)
Net periodic benefit cost (income)	$ 9	$ 4