Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 27	$ 27
Interest cost	32	34
Expected return on plan assets	(58)	(55)
Amortization of:
Net actuarial gain	(2)	(2)
Prior service cost	2	2
Settlement loss	1	1
Net periodic benefit cost	2	7
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)	(2)
Prior service cost	0	0
Settlement loss	0	0
Net periodic benefit cost	$ 2	$ 2