Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11	$ 17	$ 20	$ 32
Interest cost	83	52	166	104
Expected return on plan assets	(122)	(124)	(243)	(247)
Amortization:
Net loss	1	24	2	48
Prior service cost (credit)	2	1	3	3
Net periodic benefit cost (income)	(25)	(30)	(52)	(60)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	5	8	10
Interest cost	17	10	34	20
Expected return on plan assets	(2)	(3)	(4)	(6)
Amortization:
Net loss	0	4	0	8
Prior service cost (credit)	(10)	(11)	(20)	(23)
Net periodic benefit cost (income)	$ 9	$ 5	$ 18	$ 9