Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 16	$ 17	$ 48	$ 51
Interest cost	51	46	155	139
Expected return on plan assets	(123)	(131)	(370)	(393)
Amortization:
Net loss	24	33	72	99
Prior service cost (credit)	2	1	5	3
Net periodic benefit (income) cost	(30)	(34)	(90)	(101)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	5	17	15
Interest cost	11	8	31	29
Expected return on plan assets	(4)	(2)	(10)	(10)
Amortization:
Net loss	6	2	14	16
Prior service cost (credit)	(11)	(20)	(34)	(35)
Net periodic benefit (income) cost	$ 9	$ (7)	$ 18	$ 15