Benefit Plans (Schedule of Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12	$ 11	$ 21	$ 20
Interest cost	81	83	161	166
Expected return on plan assets	(117)	(122)	(233)	(243)
Amortization:
Net loss (gain)	6	1	13	2
Prior service cost (credit)	2	2	3	3
Net periodic benefit cost (income)	(16)	(25)	(35)	(52)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	8	8
Interest cost	16	17	32	34
Expected return on plan assets	(2)	(2)	(3)	(4)
Amortization:
Net loss (gain)	(1)	0	(2)	0
Prior service cost (credit)	(10)	(10)	(20)	(20)
Net periodic benefit cost (income)	$ 7	$ 9	$ 15	$ 18