Employee Benefit Plans, Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Benefit Plans (Textual)
The percentage of the higher 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	$ 161	$ 140	$ 119
Interest cost	73	85	98
Expected return on plan assets	(192)	(179)	(166)
Amortization of:
Net actuarial (gain) loss	81	74	41
Prior service credit	(18)	(19)	(19)
Special charges	8	5	4
Net periodic benefit cost	113	106	77
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	7	6	5
Interest cost	7	9	11
Expected return on plan assets	0	0	0
Amortization of:
Net actuarial (gain) loss	(1)	0	(3)
Prior service credit	(7)	(7)	(9)
Special charges	0	0	1
Net periodic benefit cost	$ 6	$ 8	$ 5