Employee Benefit Plans (Assumptions Used For Pension Benefits Accounting) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan | Qualified Plan
Benefit Obligations [Abstract]
Discount rate	3.30%	4.30%	3.60%
Net Periodic Benefit Cost [Abstract]
Discount rate	4.30%	3.60%	4.10%
Expected long-term rate of return on plan assets	6.85%	6.50%	6.75%
Pension Plan | Minimum | Qualified Plan
Benefit Obligations [Abstract]
Salary increase	3.50%	3.50%	3.50%
Net Periodic Benefit Cost [Abstract]
Salary increase	3.50%	3.50%	4.00%
Expected long-term rate of return on plan assets			6.50%
Pension Plan | Maximum | Qualified Plan
Benefit Obligations [Abstract]
Salary increase	4.00%	4.00%	4.00%
Net Periodic Benefit Cost [Abstract]
Salary increase	4.00%	4.00%	4.50%
Other Post-Retirement Benefit Plans
Benefit Obligations [Abstract]
Discount rate	3.30%	4.30%	3.60%
Net Periodic Benefit Cost [Abstract]
Discount rate	4.30%	3.60%	4.10%
Expected long-term rate of return on plan assets	6.85%	6.50%	6.50%
Assumed tax rate	23.00%	35.00%	35.00%