Employee Benefit Plans, Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee Benefit Plans (Textual)
The percentage of the greater of the projected benefit obligation or market-related value of plan assets in excess of which net actuarial (gains) losses are amortized	10.00%
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 111	$ 152	$ 161
Interest cost	121	85	73
Expected return on plan assets	(202)	(192)	(192)
Amortization of:
Net actuarial (gain) loss	(6)	52	81
Prior service credit	(18)	(18)	(18)
Settlement loss	2	61	8
Net periodic benefit cost	8	140	113
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	4	6	7
Interest cost	13	8	7
Expected return on plan assets	0	0	0
Amortization of:
Net actuarial (gain) loss	(6)	0	(1)
Prior service credit	(4)	(4)	(7)
Settlement loss	0	0	0
Net periodic benefit cost	$ 7	$ 10	$ 6