Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 27	$ 28	$ 81	$ 84
Interest cost	34	31	102	94
Expected return on plan assets	(56)	(54)	(167)	(161)
Amortization of:
Net actuarial gain	(2)	(1)	(6)	(4)
Prior service cost (credit)	1	(3)	4	(8)
Settlement loss	3	5	6	5
Net periodic benefit cost	7	6	20	10
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	0	1	2	3
Interest cost	3	3	9	9
Expected return on plan assets	0	0	0	0
Amortization of:
Net actuarial gain	(2)	(1)	(6)	(3)
Prior service cost (credit)	1	0	1	0
Settlement loss	0	0	0	0
Net periodic benefit cost	$ 2	$ 3	$ 6	$ 9