Benefit Plans (Schedule of Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 9	$ 31	$ 29
Interest cost	81	84	242	250
Expected return on plan assets	(116)	(121)	(349)	(364)
Amortization:
Net loss (gain)	8	1	21	3
Prior service cost (credit)	1	1	4	4
Net periodic benefit cost (income)	(16)	(26)	(51)	(78)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	11	11
Interest cost	14	15	46	49
Expected return on plan assets	(1)	(1)	(4)	(5)
Amortization:
Net loss (gain)	(2)	(2)	(4)	(2)
Prior service cost (credit)	(10)	(10)	(30)	(30)
Net periodic benefit cost (income)	$ 4	$ 5	$ 19	$ 23