Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 28	$ 28	$ 84	$ 84
Interest cost	31	30	94	90
Expected return on plan assets	(54)	(50)	(161)	(151)
Amortization of:
Net actuarial gain	(1)	(2)	(4)	(5)
Prior service credit	(3)	(5)	(8)	(14)
Settlement loss	5	0	5	0
Net periodic benefit cost	6	1	10	4
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1	1	3	3
Interest cost	3	3	9	9
Expected return on plan assets	0	0	0	0
Amortization of:
Net actuarial gain	(1)	(1)	(3)	(4)
Prior service credit	0	(1)	0	(3)
Settlement loss	0	0	0	0
Net periodic benefit cost	$ 3	$ 2	$ 9	$ 5