Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 37	$ 40	$ 114	$ 121
Interest cost	22	19	64	55
Expected return on plan assets	(48)	(48)	(144)	(144)
Amortization of:
Net actuarial loss	14	21	40	61
Prior service credit	(5)	(5)	(14)	(14)
Special charges	12	3	12	7
Net periodic benefit cost	32	30	72	86
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	1	1	4	4
Interest cost	2	2	6	5
Expected return on plan assets	0	0	0	0
Amortization of:
Net actuarial loss	0	0	0	0
Prior service credit	(1)	(2)	(3)	(5)
Special charges	0	0	0	0
Net periodic benefit cost	$ 2	$ 1	$ 7	$ 4