Employee Benefit Plans (Other Pension Assumptions) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase (average)	3.50%	3.50%
Assumed health care cost trend rate Initial trend	6.50%	6.75%
Assumed health care cost trend rate Ultimate trend	5.00%	5.00%
Assumed health care cost trend rate Year ultimate trend reached	2025	2025
Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.30%	3.60%
Nonqualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.15%	3.45%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	3.55%