Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 17	$ 17	$ 32	$ 34
Interest cost	52	47	104	93
Expected return on plan assets	(124)	(131)	(247)	(262)
Amortization:
Net loss	24	33	48	66
Prior service cost (credit)	1	1	3	2
Net periodic benefit (income) cost	(30)	(33)	(60)	(67)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5	10	10
Interest cost	10	10	20	21
Expected return on plan assets	(3)	(4)	(6)	(8)
Amortization:
Net loss	4	7	8	14
Prior service cost (credit)	(11)	(9)	(23)	(15)
Net periodic benefit (income) cost	$ 5	$ 9	$ 9	$ 22