Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 27	$ 28
Interest cost	34	31
Expected return on plan assets	(55)	(53)
Amortization of:
Net actuarial gain	(2)	(1)
Prior service cost (credit)	2	(3)
Settlement loss	1	0
Net periodic benefit cost	7	2
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1	1
Interest cost	3	3
Expected return on plan assets	0	0
Amortization of:
Net actuarial gain	(2)	(1)
Prior service cost (credit)	0	0
Settlement loss	0	0
Net periodic benefit cost	$ 2	$ 3