Employee Benefit Plans, Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Minimum [Member]
Employee Benefit Plans (Textual)
Yield curve maturities	6 months
Maximum [Member]
Employee Benefit Plans (Textual)
Yield curve maturities	99 years
Pension Plans [Member]
Weighted Average Assumptions Used to Determine Benefit Obligation
Discount rate	3.14%	4.25%	3.58%
Rate of compensation increase	3.75%	3.78%
Interest crediting rate for cash balance plans	3.03%	3.04%
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount rate	4.24%	3.59%	4.08%
Expected long-term rate of return on plan assets	7.22%	7.24%	7.29%
Rate of compensation increase	3.78%	3.86%	3.81%
Interest crediting rate for cash balance plans	3.04%	3.04%	3.04%
Other Postretirement Benefit Plans [Member]
Weighted Average Assumptions Used to Determine Benefit Obligation
Discount rate	3.32%	4.40%
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount rate	4.40%	3.72%	4.26%