Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 27	$ 28	$ 54	$ 56
Interest cost	34	32	68	63
Expected return on plan assets	(56)	(54)	(111)	(107)
Amortization of:
Net actuarial gain	(2)	(2)	(4)	(3)
Prior service cost (credit)	1	(2)	3	(5)
Settlement loss	2	0	3	0
Net periodic benefit cost	6	2	13	4
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1	1	2	2
Interest cost	3	3	6	6
Expected return on plan assets	0	0	0	0
Amortization of:
Net actuarial gain	(2)	(1)	(4)	(2)
Prior service cost (credit)	0	0	0	0
Settlement loss	0	0	0	0
Net periodic benefit cost	$ 2	$ 3	$ 4	$ 6