Employee Benefit Plans (Assumptions Used For Pension Benefits Accounting) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Qualified Pension Plans [Member]
Benefit Obligations [Abstract]
Discount rate	4.10%	4.40%	4.10%
Net Periodic Benefit Cost [Abstract]
Discount rate	4.40%	4.10%	4.70%
Expected long-term rate of return on plan assets		6.50%	6.75%
Qualified Pension Plans [Member] | Minimum [Member]
Benefit Obligations [Abstract]
Salary increase	4.00%	4.00%	4.00%
Net Periodic Benefit Cost [Abstract]
Discount rate
Salary increase	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets	6.50%
Qualified Pension Plans [Member] | Maximum [Member]
Benefit Obligations [Abstract]
Salary increase	4.50%	4.40%	4.40%
Net Periodic Benefit Cost [Abstract]
Salary increase	4.40%	4.40%	4.40%
Expected long-term rate of return on plan assets	6.75%
Non-Qualified Pension Plans [Member]
Benefit Obligations [Abstract]
Discount rate	4.10%	4.40%	4.10%
Salary increase	4.40%	4.40%	4.40%
Net Periodic Benefit Cost [Abstract]
Discount rate	4.40%	4.10%	4.70%
Salary increase	4.40%	4.40%	4.40%
Other Post-Retirement Benefit Plans [Member]
Benefit Obligations [Abstract]
Discount rate	4.10%	4.40%	4.10%
Net Periodic Benefit Cost [Abstract]
Discount rate	4.40%	4.10%	4.70%
Expected long-term rate of return on plan assets	6.50%	6.50%	6.75%
Assumed tax rate	35.00%	35.00%	35.00%